EXPERT SKIN, EAR, AND ALLERGY CARE FOR THE FURRY FAMILY MEMBERS
If your pet is itchy and losing hair, the most common reasons are allergies, parasites, and infections. If they are not itchy, then other diseases to consider are demodicosis, hypothyroidism, hyperadrenocorticism, follicular dysplasia, alopecia X, and seasonal flank alopecia. See the following article: Why is my dog or cat losing hair?
There is an underlying disease predisposing to these infections. The most common reason is allergies, but there are many others. It is possible that treatments are not completely resolving the infections or the type of medication is not correct for the type of infection. See the following articles: Allergies in dogs and cats
It is possible that treatments are not completely resolving the infections or the type of medication is not correct for the type of infection. It is also possible there is a growth or foreign material in the canal. If the infection does completely resolve, and then comes back, then there is likely an underlying cause predisposing to an infection like allergies. See the following article: Ear infections
Pets can be allergic to many of the same things that humans are, broad categories include food allergies (for example to fish) and environmental allergies (pollens, dusts, molds). A food trial is the only reliable way to diagnose a food allergy. Intradermal skin testing is performed to see what a pet is allergic to in the environment. See the following articles: Allergies in dogs and cats, Food allergies, Allergy skin testing.
Pet Dermatology Clinic
9712 63rd Ave N.
Maple Grove, MN 55369