Allergies

Skin Allergies

Skin allergies, called allergic dermatitis, are the most common type of allergic reactions in dogs. There are three main causes of skin allergies in dogs:

• Flea allergy dermatitis

• Food allergies

• Environmental allergens

Flea allergy dermatitis is an allergic reaction to fleabites. Some dogs are allergic to flea saliva. This makes affected dogs extremely itchy, especially at the base of the tail, and their skin may become red, inflamed, and scabbed. You may also notice signs of fleas, such as flea dirt, or even see the fleas themselves.

Food allergies and sensitivities can cause itchy skin, as well. The most common places dogs with food allergies itch are their ears and their paws, and this may be accompanied by gastrointestinal symptoms.

Environmental allergens, such as dust, pollen, and mold, can cause an atopic allergic reactions or atopic dermatitis. In most cases, these allergies are seasonal, so you may only notice your dog itching during certain times of the year. As with food allergies, the most commonly affected areas are the paws and ears (but also include the wrists, ankles, muzzle, underarms, groin, around the eyes, and in between the toes).

All skin allergies pose the risk of secondary infection. As your dog scratches, bites, and licks at his skin, he risks opening up his skin to yeast and bacterial infections that may require treatment.

Food Allergies

True food allergies may not be as common as people think, according to AKC Chief Veterinary Officer Dr. Jerry Klein. True food allergies result in an immune response, which can range in symptoms from skin conditions ( hives, facial swelling, itchiness), gastrointestinal signs (vomiting and/or diarrhea) or a combination of both. In some rare cases, a severe reaction resulting in anaphylaxis can occur — similar to severe peanut allergies in humans.

What most people mean when they say that their dog has a food allergy is that their dog has a food sensitivity, also known as a food intolerance. Food sensitivities, unlike true allergies, do not involve an immune response and are instead a gradual reaction to an offending ingredient in your dog’s food, for example to beef, chicken, eggs, corn, wheat, soy, or milk. Dogs with food sensitivities can present with several symptoms, including gastrointestinal signs such as vomiting and diarrhea, or dermatologic signs like itchiness, poor skin and coat, and chronic ear or foot infections.The best way to diagnose and treat a food allergy is to work with your veterinarian to manage your dog’s symptoms and discover the ingredient causing the reaction.

Acute Allergic Reactions

Perhaps the most alarming of all the types of allergies in dogs is an acute allergic reaction. Dogs, like people, can go into anaphylactic shock if they have a severe reaction to an allergen. This can be fatal if not treated. Bee stings and vaccine reactions, among other things, can cause an anaphylactic response in some dogs, which is why it is always a good idea to keep a close eye on your dog following the administration of any new vaccine, drug, or food item. Luckily, anaphylactic reactions are rare in dogs. Your dog may also develop hives or facial swelling in response to an allergen. Swelling of the face, throat, lips, eyelids, or earflaps may look serious, but is rarely fatal, and your veterinarian can treat it with an antihistamine.

Treating Allergies in Dogs

The best way to treat an allergy is avoidance of the cause and allergen. This may or may not always be possible. But, in terms of treatment, it depends on your dog’s type of allergy. For example, the best way to treat flea allergy dermatitis is to kill the fleas, whereas the best way to treat a food allergy or food intolerance is a change in diet. In addition to any lifestyle changes that might be necessary, your veterinarian may also prescribe a medication for your dog that will help control the signs associated with the allergic reaction, such as itching and any secondary skin infections that might have developed as a result of the irritant. If your dog has a severe allergic reaction, your best course of action is to get him to an emergency veterinary hospital as quickly as possible.