The Itchy Dog: is it an Allergy?
Scratching is a very common symptom in dogs, and you as an owner should aim to nip it in the bud early before self trauma causes secondary injuries to your dog. However, before wondering whether your dog could have an allergy, you must rule out the common parasitic (fleas and mites), bacterial (hot spots) and fungal (ringworm and yeast) infections. See my article Is your Dog Scratching to explore these in greater detail.
Just as allergies have become more common in children these days compared to several generations ago, veterinarians are seeing far more allergies in pets too. It is difficult to explain this phenomenon, theories range from alterations in the content of pet foods to the use of modern day household cleaning products or simply genetic evolution. One thing is certain, whatever the cause, allergic dogs benefit hugely from avoiding the offending allergen or, if that is impossible, appropriate treatment to minimize the itchiness.
Lets start with the presenting signs of an allergy in dogs. Itchiness can manifest itself not only as obvious scratching at the neck and flanks, but also as face rubbing, foot licking or chewing and over grooming. Foot licking, for example, is often perceived by owners as normal, when in fact the dog is responding to itchy feet in the only way it can, by licking them. The skin between the toes may turn red and sore due to the compulsive licking, and in white dogs such as West Highland White Terriers and Bichon Frises, the fur is stained brown by saliva.
Ear infections are another common sign of an underlying allergy. Though general waxiness, hair in the ear canals, lack of ventilation, bacteria and yeast may trigger the infection, an underlying allergy is often the root cause of the itchiness. If your dog gets recurrent ear infections, by eliminating an underlying allergy you may prevent your dog from going over the itchiness threshold and developing full blown ear infections.
So, what are the common allergies in dogs?
For convenience they are best separated into 4 categories.
1) Flea bite hypersensitivity
2) Adverse food reaction
3) Atopic dermatitis
4) Contact dermatitis
Flea bite hypersensitivity is relatively straight forward to cure. It is a simple case of eliminating every single flea on the dog and, crucially, in his/her environment. The itchiness is caused by an allergic reaction to the flea saliva, and so even a solitary flea can trigger a scratching frenzy. To rule out flea bite hypersensitivity, all animals in the house (dogs and cats) should be treated with a reputable veterinary spot on medication monthly without fail, and the house should be thoroughly sprayed with an insecticidal spray.
Adverse food reactions are more difficult to treat as it can be difficult to isolate the precise ingredient responsible for causing itchiness in your dog. Not only that, treating adverse food reactions requires owners to be exceptionally disciplined and motivated in preventing their pet having even a single treat unless the exact ingredients are known to be safe.
There are two ways of diagnosing an adverse food reaction (also known as a food allergy). For those readers for whom cost is not an issue, a blood test can be done to measure for ingredient specific antibodies in the bloodstream. The blood test is quite costly, and if combined with a blood test for environmental allergens is usually upwards of $400 (
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