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What Causes Fevers in Dogs?

The most common way to see if your dog has a fever is to feel his nose. If it’s cold and wet, he’s usually healthy. If, however, his nose is dry and hot, then it’s likely that he has a fever.

There’s nothing wrong if you use this method but it may not always be enough to do a full diagnosis. There are other elements to consider.

What’s the normal temperature range for a dog?

People have a healthy temperature range between 97.6 – 99.6F degrees. Dogs, on the other hand, have a wider and higher range between 99.5 and 102.5F degrees. However, there’s a lot more to a fever and dog health than merely touching his nose.

Canine Fever Symptoms in Dogs:

Dogs don’t speak English so they can’t actually tell you when they have a fever. However, these are some common canine fever symptoms to watch for:

• Warm dry nose.
• Warm ears.
• Red eyes.
• Coughing.
• Vomiting.
• Lack of energy/lethargy.
• Not eating.
• Shivering.

 What Causes Fever in Dogs?

A fever in your dog may be caused by inflammation or an infection as his body tries to fight the fever.

Causes may be internal or external and include:
Ear infection.
• Organ infection in the lungs, kidneys or elsewhere.
• Abscessed or infected tooth.
• Chronic virus or bacterial disease.
• Urinary tract infection.
• An infected cut, scratch or bite.
• Vaccinations (usually only lasts a maximum of 48 hours).

Your dog may ingest poisonous material that can cause a fever and other problems. The poisons include:
• Human medications.
Toxic plants.
• Antifreeze.
Some human foods such as xylitol (an artificial sweetener).

If you believe your pet has been poisoned, ring the Pet Poison Emergency Hotline.

How do you take your dog’s temperature?

There are two ways to test the temperature of your pet. One is by using an ear thermometer and the other, less pleasant, way is by using a rectal thermometer. You can buy pet thermometers and should always keep a couple in your dog first aid kit. It only takes a minute or so to register an accurate reading.

Ideally, you would do the ear test. It measures the infrared heat coming from the eardrum when placed deep in the horizontal part of his ear canal. This type is more expensive but easier to use for both you and your dog. Never buy a glass version and always read the instructions fully before doing anything.

If you decide to use a rectal thermometer, you need to lubricate him with either baby oil or Vaseline. Slide the tool in about an inch and take it out the moment you have a reading.

When should you take your dog to the vet?

If your dog’s temperature is 103F degrees or more, that’s definitely a fever so you must go straight to the vet or hospital. 106F degrees or higher can cause damage to a dog’s organs and may prove fatal so never let it get that high.

Once you get to the vet or hospital, they’ll need to check his history before trying to diagnose the problem. Even though information such as allergies, surgeries, medicines, past ailments and vaccines are essential, you’ll also need to advise of anything more recent such as injuries, other symptoms and how long the fever has been running. What has your dog eaten recently that may have been out of the ordinary? This includes plants and even human food given by mistake, maybe by a child.

A good tip is to keep a written copy of your dog’s complete history in your wallet or purse. Update it every time something needs to be added. Doing that one simple thing and showing it to your vet or at the hospital may save precious time when it’s most needed.

After doing a physical examination, the vet may need to do tests such as a blood count, urinalysis or a biochemistry report. These tests may reveal underlying conditions. If it’s an infection, you may need medication and extra tests.

How can you ease your pet’s fever?

To soothe your dog’s fever, get a cold soaked cloth and rub some cool water around his ears and paws. Keep a close eye on him. Once his temperature has dropped a bit, you can stop using the water. Get him to drink water if he can. Even if he seems to recover, monitor him because the fever can return easily. If it does and he has other symptoms, the vet should be your next stop. Always err on the side of caution.

Never give your pet any form of human medication, even if it’s only aspirin, because it’s extremely toxic for animals.

Note: This article is only informative to help you understand dog fevers. It should NEVER replace a vet consultation or diagnosis. While this can help you, the vet is the professional. If you think a fever has affected your beloved pet, ring your vet so he can get treated quickly and professionally.

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Dog Ear Infections

Symptoms, Prevention and Treatment

Dog Ear Infections
If your dog whines and scratches his ears fiercely, sometimes causing them to become red raw, it may be due to an ear infection; something that’s common in dogs.

There are three major types of ear infections, all starting with the word “otitis” (meaning inflammation): internal, media and externa. Each type affects a different part of the dog’s ear. Ear infections are very common in dog breeds with big floppy ears such as Cocker Spaniels and Basset Hounds.

Approximately 20% of dogs have one or more ear infections at some point in their lives. There are ways you can decrease the severity and incidents of ear infections, which can affect one or both ears at the same time.

Interna and media are the types that affect the inner and middle ear passage and often are caused by an infection that starts in the outer part of the ear.

Externa refers to the outer ear. Inflammation can affect the cells that line the outer part of the ear passage.

Dog Ear Infection Symptoms:

There are many possible symptoms a dog may exhibit if an ear infection exists. Due to the extreme sensitivity of a dog’s ear canal, some symptoms are very obvious. Symptoms include:

• Shaking of the head.
• Scaly skin.
• Whining.
• Pawing at the ear.
• Odours.
• A smelly, dark discharge.
• Itchiness.
• Swelling and redness.

How do dogs get infections in their ear(s)?

A dog’s ear passage is in an “L” shape and more vertical than that of a human ear. The shape causes a certain degree of fluid retention as a result, thereby increasing the likelihood of ear infections happening.

Ear infections can be caused by many things including:

Mites (less frequent in adult dogs than puppies).
• Viruses.
• Bacteria.
• Fungus/yeast.
• Reactions to drugs.
• Thyroid disorders.
• Moisture (a good breeding ground for yeast and bacteria).
• Build-up of wax.
• Autoimmune disease.
• Injuries.
• Encephalitis.
• Meningitis.
• Excessive cleaning.
• Foreign matter.
• Tumours.
• Hormone issues.
• Plant material.
• Diseases of the endocrine system (for example, diabetes).
• Allergies (50% of dogs with skin problems and 80% of dogs with food allergies will have ear infections at some point).

Advanced cases of ear problems can be extremely serious and may cause facial paralysis, deafness, vestibular disease (poor coordination, dizziness, circling and head tilting). Prevention, early diagnosis and treatment are crucial in avoiding ear problems becoming worse.

Your vet needs to precisely diagnose the ear infection.

Dog Ear InfectionsAs soon as you notice any problems with your dog’s ears, you must visit the vet as a matter of urgency. Ear problems may be very painful and can spread and get worse quickly. Don’t attempt to treat such problems yourself.

Provide your vet with as complete a history of your pet as possible. If you’re seeing your regular vet, he’ll have the history already. However, if you visit an emergency hospital or vet you haven’t seen before, he won’t know anything until you give him the relevant information. Ear infections can hit at any time of day or night. Your dog may wake in the middle of the night, scratching his ear violently and whining loudly. So get him straight to the vet or hospital.

Information you’ll need to give your vet:

• Duration of, and type of, symptoms.
• What food you have given your dog.
• If he’s on medications for any reason.
• How often you clean his ears.
• If he has allergies or other health issues.
• Any previous ear infections (when, what type and how were they treated)?
• Recent activities such as a groomer’s session, a bath, swimming or walking in a dog park.
• If you have trimmed his ear hair.

The vet will need to examine your dog’s ears. He may use sedation if the ears are too sore to be handled. Even if one ear is the problem, he’ll always check both anyway.

His exam would generally include:
• Visually looking for any symptoms such as redness, rawness, inflammation, crustiness, blood or other oozing matter or anything else that shouldn’t be there.
• A gentle ear massage to test pain levels.
• Tissue cultures and examination.
• Biopsy and/or x-rays (in more severe and chronic cases).
• Using an Otoscope. This looks into the ear to see if foreign objects, waxy build-up, ear mites or damage exists.


It’s only after an exam is done that a vet can decide on the best treatment plan. Usually he’ll clean both ears properly and prescribe either oral or topical medication that you’ll keep on using at home. He’ll also usually prescribe painkillers to help reduce inflammation.

You’ll need to take him back to the vet to be checked again within the following week or so, to ensure the ears are healing or have healed. You’ll need to keep a close eye on his ears until they’re fully healthy.

Easy cases can be settled within 10-30 days. However, some may become chronic and other times it might be months before the ears come good.

Do everything your vet tells you to do, without any detours, or your beloved pet may suffer more, have the same problem again or it may last longer. Use all of the medication, even if the ears look ok half way through the treatment.

Tips to help you prevent your dog from having ear infections.

Dog Ear InfectionsPrevention is the best medicine. Learn the right way to clean your pet’s ears. If moisture causes his problems, ensure you dry his ears fully after he has had a swim and avoid water getting in his ears while bathing him.

Here’s a good way to clean your pet’s ears.
Fill his ear canal with a special cleaning solution. Massage the outer part of the vertical ear canal. Wipe it dry and clean with absorbent gauze. Avoid cotton and paper towels as they can leave fibres in the ear which can cause irritation.
Be aware that dogs would normally scratch their ears or shake their head after you have applied the cleaning solution so let him do it.

Cotton buds can be used to clean the ear’s folds but never slide them inside the canal or you may push debris in deeper and it can end up being in a clump. It may even rupture the ear drum itself.

When cleaning your pet’s ears, have some treats handy, especially if he’s being good and keeping still. Praise him for being a good dog and perhaps do something fun with him afterwards.

Part of caring for your dog is managing his overall health, and that includes his ears. It’s important to have a good vet because you can rely on him for help if your dog needs him. Prevention is always best, although it’s not always possible.

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Dog Flea and Tick Medicine Side Effects

Dog Flea and Tick Medicine Side Effects
Dog Flea and Tick Medicine Side Effects

Many dog owners ask can flea medicine make a dog sick? If antiparasitic drugs aren’t used the correct way, yes they can harm dogs. Dogs are mammals, and are physically quite similar to people. Therefore Canines would have the same, or similar, reactions that people would have.

When you talk about the safety and side effects of flea medicine on dogs, there’s a clear distinction between tolerant and toxic. The toxic type can be either acute intoxication (severe poisoning) or chronic intoxication. However, there’s no need to know what type your dog has initially. It’s only afterwards that you need to learn so you can avoid an adverse reaction to flea and tick medicine.

Tolerance to Anti Flea Medication for Dogs

Tolerance relates to how well a dog can handle having the recommended dose of the drug in his system. There’s always a risk of adverse side effects with drugs, in dogs and humans. Each animal or person is an individual which means the effects are never guaranteed.

Using a person as an example; if you take aspirin at the recommended dose, it may be easily tolerated OR you could have side effects. This is because everyone is different. There are a lot of different types and strengths of painkillers for this very reason.

If a dog is given any drug, he may be fine and it does what it’s supposed to do. If the same treatment is given to a different dog with the same issue, he may have side effects such as: nausea, vomiting, itchiness and so on. Generally side effects of flea treatment occur in less than 10% of cases.

Generally speaking, side effects of a medicinal treatment are less unpleasant than what happens if the dog is poisoned because he was given too much of antiparasitic or other drugs. Side effects usually only last a few days.

As with humans, sick, weak, old and young animals are more likely to suffer from side effects because they’re not as capable of handling the drug they have been given. Pregnant dogs are also in this same category. Some dog breeds are more susceptible to adverse reactions of drugs than others.

Some of the antiparasitics may irritate a dog’s skin, eyes or respiratory system and may have an acute severe reaction just after being treated. A powerful irritant may cause an animal to react violently and he may fall or stumble and hit his head or other body part and be injured as a result. Such irritants may be so strong that the reaction can cause abortions and premature births in heavily pregnant dogs.

Manufacturers must test every drug they make before it can be sold. Animal tolerances must be tested on the end product to see what occurs with different doses including higher than normal. However, only a small number of animals are tested so it’s impossible to know for certain what reaction may/may not happen until the drugs are sold and owners start using them.

Spot-on Flea Treatment for Dogs with Large Concentrations of Active Ingredients

Pets can tolerate most spot-ons. However, most spot-ons have high concentrations of the active ingredients (around 10%). In some products it may be as high as 65%. This isn’t good because risks of adverse reactions is very real for the young, the sick, the weak and also for small breeds of dogs.

Tests have shown that ready-to-use cattle pour-ons (very similar to pet spot-ons) have some ingredients that can irritate the animals, especially cows and calves. Generally the active ingredients in the pour-ons for cattle are of a lower concentration than that for dogs. Cattle get 1% – 5%mg/kg body weight. Some of the dog spot-ons with up as much as 65% of permethrin can contain 100mg/kg body weight.

Amitraz is a brand that can’t be given to cows as they can’t tolerate high doses. Dips or sprays are used instead and, even then, reactions may happen. The spot-ons for canines can have up to 10% amitraz and doses may be as high as 45/mg/kg body weight.

It’s hardly surprising that dogs display serious side effects to spot-ons. Synthetic pyrethroids and amitraz are toxic to cats and it can cause fatalities.

Intoxication or Poisoning

Golden Retriever Dog
Golden Retriever Dog

Too much of the drug can cause poisoning, leading to a myriad of behavioural and physical reactions, depending on the strength of the doses and what organs become affected.

Most animals can tolerate a recommended dose but all animals will be affected to some degree if given too much of the drug.

If a dog becomes intoxicated after having an overdose, accidents are likely to occur. The reactions that can happen will usually depend on the extent of the overdose.

A slight overdose may only create mild side effects. A huge overdose can cause the same or different reactions but the intensity will be stronger and, if left untreated, may prove fatal.

As for tolerance, that varies enormously and depends on gender, breed, size of dog, age, puppy or adult, overall health and so on. Therefore it’s impossible to predict what can happen as a result of poisoning or overdose.

Toxicity is always tested with any new drug. Most studies are on the active ingredients, not the end product. These tests are standardised by regularity boards.

Acute Intoxication

Acute intoxication occurs when a pet is exposed to one or more drugs within a short time and the reactions will be severe and immediate.

As with people, animals can suffer poisoning after they inhale, ingest or make contact with a large amount of the antiparasitic drug. This may occur due to admin errors, faulty equipment, carelessness, by accident or an incorrect dilution. As explained earlier, weak, young, old and sick animals are more prone to poisoning because they can’t handle the strong drugs as easily as healthy adult pets can.

Among the most dangerous of forms are the concentrates because they must be diluted before being used. Again, there can be numerous reasons for the mistakes with dilution.

Symptoms of acute poisoning of dogs include: nausea, pain, vomiting, sickness, diarrhoea, lameness, fainting and colic. The effects will depend on the doses given and what active ingredient was included.

Chronic Intoxication

Chronic intoxication happens if a dog is exposed to low doses of a drug (inhalation, ingestion or contact) but over a long time period. The damage builds slowly and there may be no effects until months or even years later.

This may occur even after years of regular treatments for heartworm, ticks or fleas. Products are usually safe but long-term damage can’t be ruled out, particularly if the drug hasn’t been used properly or there have been long term admin mistakes that lead to chronic overdosing.

Some psychosomatic diseases that people may suffer (e.g. dippers’ flu, chronic fatigue syndrome, etc.) after a long period of exposure to antiparasitics have little chance of affecting dogs and would be extremely difficult to even recognise, let alone treat.


Allergies are a special type of problem as they’re not caused by an intolerance or toxic reaction to the drugs. Instead, it’s an individual, unpredictable immunological reaction that can happen in an animal. It’s rare for these drugs to cause an allergic reaction.

There are some known cases where powerful (sometimes life-threatening) allergic reactions have occurred. However, it’s NOT a reaction to the drug itself. Instead, it’s the dog’s body reacting to the large number of parasites being killed. Their deaths release a large number of allergens which then affects the dog’s health severely.

The most frequent cases occur in both dogs and cats who have heartworm, if they’re treated with specific preventatives including macrocyclic lactones. These and other compounds are good for eliminating the heartworm larvae in the animal’s blood. Heartworm is more common in dogs and cats living in places that have hot weather but can still happen in cold weather.

The preventative drugs stop the larvae becoming adults. However, if the animal is severely infected and this is the first treatment, the allergens that hit the animal can create an allergic shock.

Symptoms that may occur approx. five hours after the treatment include: vomiting, nausea, rapid breathing, trouble breathing, weakness, pulse is faster or slower, fever or uncoordinated movements. Various therapies include: giving more fluids, giving corticosteroid drugs and shock treatment.

An additional possible complication if dogs are treated for heartworm is that, due to the doses given, adult worms may be killed. Their remains may lodge in the heart or pulmonary artery and block blood vessels, which leads to lung damage and, if severe and not treated properly, may prove fatal.

Any dog that’s treated with macrocyclic lactone must also be tested for existing heartworms. If it’s positive, the vet must devise the best course of treatment that won’t further harm the animal.

Beagle Dog
Beagle Dog

Are Oral Flea and Tick Control for Dogs or Topical Spot-on Flea Treatment for Dogs Better for Antiparasitic Treatment?

There are many schools of thought on this question. Some owners claim that the topical treatments are less toxic than oral flea control. Other owners believe oral flea control is much better than spot-ons. However, neither is true. The form of delivery makes no difference to the safety factor of the drug.

Many antiparasitic medications for dogs that are administered topically should get absorbed into the animal’s blood to fight off parasites. The absorption is either through the skin or by the dog licking. This applies to ALL spot-on drugs certain specific ingredients such as: moxidectin, selamectin, emodepside and others. Other topical drugs don’t need to get into the blood. They’re absorbed by licking or the skin.

The active ingredients of all topical drugs get into the dog’s organism. These products have been manufactured to be tolerant. However, the largest number of adverse reactions occur because the drug isn’t used properly or because the owner has bought a treatment made only for a cat but used it on a dog instead.

Antiparasitic medicines that come in tablet, feed additive or injectable forms also get into the animal’s organism and kill parasites. They have also been designed to be tolerated.

Injectable and oral drugs don’t expose the owner, carer or vet to the drug because the animal’s hair isn’t contaminated. Topical treatments do leave active ingredients in the animal’s hair. Owners and children playing with pets are likely to be exposed to the drug as well. Although generally harmless, it’s possible for humans to have an adverse reaction, especially children.

Safety Margin and Therapeutic Index

The safety margin is the ratio between a single dose of a drug that doesn’t cause any reaction in the animal, divided by what’s recommended as a single dose. If the recommended dose is 10 mg/kg body weight, and the safest highest dose with no reaction is 50 mg/kg body weight, the safety margin is five. This means that administering double the dose should also be safe. If the margin was two, a double dose would likely cause a reaction. Margins usually vary between three and ten. Older parasiticides had a margin of two so the doses had to be accurate.

Worming drugs often have the margin figure on the label or packet written in such a way that you would definitely read it (not in every country), whereas ectoparasiticides don’t always have this important information.

Frequent Errors Lead to Tolerance or Toxicity Problems

A few situations can exist where a dog may receive an overdose. The most common are listed below:

Incorrect Dilution

This may happen in any powder or liquid for spraying or dipping that needs to be diluted before use. It also applies to food additives. Carbamates and organophosphates are particular active ingredients used more for horses, poultry and livestock. Wrong dilutions can cause overdosing and intoxication.

Incorrect Weight Determination

You need to know your dog’s weight. If you’re not accurate and overestimate, an overdose may occur. You may have faulty scales or, in the case of larger animals, it may be hard to get the correct weight reading.

Incorrect Dosing

If you have the correct weight, you can still give your dog an overdose if equipment is faulty. In livestock, it may be drench guns, syringes and other tools. In large herds of cattle, if they’re not marked correctly, a double dose may be given if they’re not identified as already receiving the treatment. In dogs and cats, if pills are split and used for smaller animals as a cost-cutting exercise, the reactions are more likely to occur.

Incorrectly Using Macrocyclic Lactones in Dogs

Certain dog breeds are intolerant to various macrocyclics and other meds that cross the brain-blood barrier. Effects may be more serious if given slightly higher doses than recommended. So, dosing MUST be accurate. Collies and related breeds have a specific mutation that causes the blood-brain barrier to be extra permeable to such drugs than other breeds without this mutation.

Other affected breeds are: Australian and Mini Shepherds (50%), Shetland Sheepdog (15%) and Shepherd dogs (10%). A few others are less affected. A test is the only way to know if the dog has this mutation. The more testing that’s done, the more breeds that will be acknowledged as having it.

If a dog doesn’t have this MDR-1 mutation, the dose that won’t cause harm is ~2000 mcg/kg body weight. If a dog does have the mutation, it’s 60 mcg/kg body weight.

Using Expired or Spoiled Products

Storage methods can easily affect the stability of products, even if unopened. High temperatures and extreme yo-yo weather can cause damage. Storage may be in sheds, barns or other places where the temperature isn’t controlled and the active ingredients break down so the product is useless. They become more toxic.

Where possible, store products in a cool room out of any direct sunlight. Only open what you need because the moment something is opened, it’s exposed to air and problems may occur if not used.

Using Off-Label Dog Tablets for Fleas and Pet Spot-ons

People are keen to save money so they go for cheaper products. If you have more than one pet, it’s likely that the same product will be used. For example, on a dog and cat or a big dog and small dog. Using it this way carries bigger risks and it’s harder to determine the right dosages for different dogs and cats and the other variables.

If a product has only been partly used, it may break down so it may be harmful if used. Some products are toxic for cats or dogs but fine for the other animal.

Off-label Use of Livestock Products in Pets

In country areas where people have plenty of access to antiparasitic drugs for livestock, they tend to try a small amount on dogs to save money. While it may work sometimes, other times it may cause severe harm. Often the livestock instructions don’t have information about dosages for dogs so working out what’s right is nearly impossible. Your vet is the person to talk to if you have ANY doubts or questions about medications. Better to be safe than sorry.

Off-label Use of Crop Pesticides in Domestic Animals

Sometimes crop pesticides are used on dogs, despite being more dangerous than livestock products. They have no instructions for use on any animals. Solvents in them may be hazardous to animals as they’re usually chosen specifically for plants.

Final Thoughts on Antiparasitic Drugs for Dogs

Talk to your vet! Never do things without instructions.

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Best Dog Flea and Tick Medicine