Canine Atopic Dermatitis

Atopic dermatitis (also called canine dermatitis, canine atopy) is one of the most common dog skin allergies. Itchiness and skin inflammation are the main symptoms. Canine atopy is caused by allergens such as pollens, weeds, and house dust mites. This page looks at the symptoms, causes, diagnosis and treatment of this canine skin problem.

Your dog has itchy skin and is scratching and licking himself incessantly. His skin is getting raw, red, and infected.

Sounds familiar?

Dogs seem to be having skin problems more frequently now than ever before, and itchy skin is a hallmark symptom of canine atopic dermatitis, or canine atopy, which is the most common type of dog skin allergies. However, having said that, not all dogs with itchy skin are allergic sufferers, since there are other problems that can cause similar symptoms. It is therefore very important to get your dog to the vet for an allergy test if you suspect your dog has atopy.

It is equally important for us dog parents to educate ourselves as much as we can about canine allergies - sometimes some veterinarians do mis-diagnose and inappropriate medication can be prescribed.

Information on Canine Atopic Dermatitis

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What is Canine Atopic Dermatitis?

Shar Pei Canine atopy is a genetic inflammatory skin disorder in which the dog becomes sensitized and reactive to certain environmental allergens, such as pollens, weeds, housedust mites, and molds.

Many people used to think that in atopy, the allergens were inhaled into the respiratory system, and as such canine atopy is also often referred to as "inhalant allergies". Many veterinary dermatologists now believe that there may be a combination of allergen exposure both by inhalation and by contact of the pollens or dust mites with the skin.

As well, according to the veterinary medicine literature, canine atopy usually shows up in dogs at 1 to 3 years of age. However, please note that this 1-3 year time period is just a rough guideline. There are dogs who do not show allergic symptoms until mid-life or older, and there are dogs who start showing symptoms as early as a few months of age. In fact, it is more accurate to say that canine atopic dermatitis usually occurs within 1 to 3 years of a dog being exposed to continual environmental allergens. So if you live in an area with few environmental allergens, even though your dog may have the genetic predisposition to develop atopy, he will probably not do so. However, if you then move to an area with a lot of allergens, your dog will likely develop atopy within 1 to 3 years of exposing to such allergens.

What Breeds are Predisposed to Atopic Dermatitis?

Since canine atopy is a genetic disorder, certain dog breeds have a higher possibility of developing this disorder. These breeds include the terriers, the Chinese Shar-Pei, Dalmatians, Retrievers, Irish Setters, Miniature Schnauzers, Bulldogs and other brachiocephalic breeds. But remember that any breed of dog can develop atopy, even mixed breeds.

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Symptoms of Canine Atopic Dermatitis

Itching (pruritus) is the hallmark symptom of canine atopic dermatitis. Suspect atopy if your dog itches, but otherwise his skin appears normal. The itchiness can be mild, moderate, or severe, although most atopic dogs do not start off with severe itching.

The itching may be generalized, or localized usually in the armpits, the face, ears, and feet.

As a result of constant scratching, licking, and chewing due to itchiness, an atopic dog can develop sores and lesions on the skin which, over time, will change color (usually the affected areas become darker). If timely treatment is not given, these skin lesions (e.g. hot spots) will go out of control and, because of the constant licking and mauling by the dog, can easily result in secondary bacterial or yeast infections.

Bacterial infections are most commonly caused by the staphylococcal bacteria. You can find small red bumps (papules) or small pimple-like lesions (pustules) on the dog's skin. When these bumps and lesions rupture, scabs form.

Yeast infections are caused by the yeast Malassezia most of the time. The affected dog is rather itchy and smelly, with greasy yellow scales and red skin.

In addition, some atopic dogs may also show other signs such as:

See this video for images of common skin symptoms in dogs with atopy:

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Diagnosis of Canine Atopy

Not all itchy dogs have canine atopic dermatitis, since there are many other things that can make a dog itch. Do not assume that your dog has atopy if he scratches incessantly. More importantly, if your vet bases his diagnosis solely on clinical signs without doing any tests, insist that laboratory tests be done to avoid mis-diagnosis and mis-use of medication.

The Gold Standard for atopy diagnosis is the intradermal skin test, in which the allergic dog is injected with very small amounts of allergens in several areas very superficially into the skin. These injected areas are then examined about 15 minutes later for hive-like reactions.

Another test, though less accurate than the intradermal skin test, is an in vitro test called blood ELISA or RAST testing.

The ELISA test is considered not as accurate because many dogs without atopy are tested positive, which may happen when the dog has been exposed to the allergen and has developed circulating antibodies against it. As such, even if the dog is tested positive, it does not always mean that the circulating antibodies are actually the culprits that are causing the symptoms which the dog is showing. Before doing the ELISA test, therefore, other possible problems have to be ruled out.

Treatment of Canine Atopic Dermatitis

Can canine atopy be cured?

Unfortunately, this canine allergy usually cannot be cured; it can only be controlled. Sometimes, though, if an atopic dog is moved from a place with high amounts of allergens to a place with few allergens, the dog may not show signs of allergies although technically (genetically) he is still "allergic".

Atopic dermatitis in dogs can be controlled either by medications (e.g. antihistamines, corticosteroids) or, if medicines fail to control the symptoms, some veterinarians may also suggest immunotherapy ("allergy shots").

While corticosteroids may provide some relief to a dog's itching, long-term use of these drugs should be avoided if at all possible, since they can wreak havoc to a dog's immune system, and cause a host of adverse side-effects. Also, do not allow your vet to give your dog steroids without a proper diagnosis. If it is deemed necessary to use steroids, ask the vet if it is possible to first try using the topical form.


Natural Allergy Remedies

There are also natural remedies such as herbs, supplements, etc. that can be used to alleviate allergy symptoms in dogs and boost the dog's immune system. Check out our page on Natural Alergy Relief for Dogs for more information.

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