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Ask Dr. Michael Salkin Your Own Question
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Dog
Satisfied Customers: 32739
Experience:  University of California at Davis graduate veterinarian with 45 years of experience.
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My dog has been diagnosed with a yeast skin infection this

Customer Question

my dog has been diagnosed with a yeast skin infection this from a allergy to food . She is a ten year old Labrador . we recently changed her food as she was overweight this according to our vet caused sores to caused sores to appear on her legs although I did tell them she had a operation when puppy on her elbows, she know has lumps of fur coming out when we groom her . We are getting concerned we have been given cream for the sores and medicated shampoo and to wash her twice weekly. she has had three different courses of antibiotics . The allergy test showed allergic to every meat except venison wheat soya potatoes and peas .We are not sure even our vet says he doesn't know
Submitted: 1 year ago.
Category: Dog
Expert:  Dr. Michael Salkin replied 1 year ago.
I'm sorry that your question wasn't answered in a timely manner. Secondary bacterial and yeast (Malassezia) infections are common with allergic dermatitis whether the allergy is to environmental allergens such as pollens, molds, dust, or dust mites, etc. or to foods. The presence of these infections is determined by performing a cytology - a microscopic exam of a small sample of representative skin - looking for abnormal numbers of either bacteria or yeast. Antibiotics in the cephalosporin class such as cephalexin are usually prescribed to address bacterial infections (pyoderma). Ketoconazole is the usual drug prescribed to address yeast infections. Food intolerance/allergy is addressed with prescription hypoallergenic diets. These special foods contain just one novel (rabbit, duck, e.g.) animal protein or proteins that have been chemically altered (hydrolyzed) to the point that Tia's immune system doesn't "see" anything to be allergic to. The over the counter hypoallergenic foods too often contain proteins not listed on the label - soy is a common one - and these proteins would confound our evaluation of the efficacy of the hypoallergenic diet. The prescription foods are available from her vet. There are many novel protein foods and a prototypical hydrolyzed protein food is Hill’s Prescription Diet z/d ultra (a hydrolyzed protein diet is my preference because it avoids the possibility of my patient being intolerant to even a novel protein). A positive response is usually seen within a few weeks if we’ve eliminated the offending food allergen. Food intolerance can arise at any age and even after our patient has been eating the same food for quite some time.I'm not certain what your vet doesn't know. Please clarify this for me and please respond with further questions or concerns if you wish.