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My 3 year old Italian greyhound mix will not stop

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My 3 year old...

My 3 year old Italian greyhound mix will not stop scratching. She does not have fleas or dry skin. I have washed her with medicated shampoos and conditioners and given her benadryl. Nothing seems to help

Veterinarian's Assistant: I'll do all I can to help. Using the wrong medication for fleas can be dangerous. You should definitely talk to the Veterinarian. What is the Italian Greyhound's name and age?

Zoey, and she is 3

Submitted: 1 month ago.Category: Dog Veterinary
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Answered in 4 minutes by:
3/24/2018
Dog Veterinarian: Dr. Michael Salkin, Veterinarian replied 1 month ago
Dr. Michael Salkin
Dr. Michael Salkin, Veterinarian
Category: Dog Veterinary
Satisfied Customers: 33,287
Experience: University of California at Davis graduate veterinarian with 45 years of experience
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You're speaking to Dr. Michael Salkin. Welcome to JustAnswer. I'm currently typing up my reply. Please be patient. This may take a few minutes.

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Dog Veterinarian: Dr. Michael Salkin, Veterinarian replied 1 month ago

I'm sorry to hear of this with Zoey. I'm going to post my entire synopsis of the pruritic (itchy) dog for you. There's quite a bit of information so please take your time perusing it and then return to our conversation with additional questions and concerns...

Pruritic dogs are suffering from an allergic dermatitis in the great majority of cases. Allergies to flea saliva (apparently ruled out), environmental allergens (atopic dermatitis) such as pollens, molds, dust and dust mites, and foods should be considered. (Paw and extremity licking indicates both atopy and a food intolerance and so it behooves vets to distinguish one from another.) In many instances, a concomitant pyoderma (bacterial skin infection), yeast infection (Malassezia), or mange mite (Demodex or Sarcoptes) might be contributory.

Zoey's vet can check a sample of her skin surface microscopically (a “cytology”) for abnormal numbers of bacteria and yeast and skin scrapings can be taken in an attempt to find mites. Sarcoptes is the most pruritic of the mites. Pyoderma is treated with a minimum of 3-4 weeks of an antibiotic in the cephalosporin class such as cephalexin (Keflex) and yeast is addressed with ketoconazole for at least a month. Mites are addressed topically, orally, and by injection.

Our dermatologists tell us to apply an over the counter flea spot-on such as Advantage/Advocate, a fipronil-containing product such as Frontline or, preferably, one of the newer prescription products available from Zoey's vet to which fleas are less likely to have become resistant even if fleas aren’t seen. Dogs can be such effective groomers so as to eliminate all evidence of flea infestation. Dogs who remain primarily indoors can contract fleas because we walk them in on us and flea eggs and larva can remain viable in your home for months. As the weather warms or you turn on heaters at this time of year, egg hatches are common. If the area between the edge of Roxie's rib cage and tail (the “saddle” area) is particularly excoriated, a flea saliva allergy should be the most important differential diagnosis. In severe cases, an anti-allergenic prescription glucocorticoid (steroid) such as prednisone will work wonders for dogs allergic to the saliva of the flea. If you have other pets they may have fleas too but may not be allergic to the flea’s saliva.

Environmental allergies (atopy) are usually initially addressed with prednisone as well. In some dogs an over the counter antihistamine such as clemastine (Tavist) at a dose of 0.025 - 0.75mg/lb twice daily or diphenhydramine (Benadryl) dosed at 1-2mg/lb twice daily (maximum dose of 50 mg at any one time) may be effective. Antihistamines, however, aren’t reliably effective. Adding fish oil to the diet at a dose of 20mg/lb daily of the EPA in the fish oil might synergize with antihistamines to provide better anti-pruritic action. The omega-3 fatty acids in fish oil are antiinflammatory but may take 8-12 weeks to kick in. The new cytokine antagonist oclacitinib (Apoquel) is likely to revolutionize how we address atopic dogs and should be discussed with Zoey's vet. Oclacitinib works as well as a steroid without a steroid's adverse effects. The new injectable immunomodulary drug IL-31 (Cytopoint) should also be considered. Please note that atopy, at least initially, should have a seasonality to it while a food intolerance should cause pruritis regardless of the season. Chronically atopic dogs may be pruritic year round.

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 Zoey'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. (I prefer the hydrolyzed protein diets 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.

We need to consider seborrhea in such a patient as well. This is skin disorder of keratinization and maturation. It's a diagnosis of exclusion of the above mentioned skin disorders and can be suggested by skin biopsy.

You also have the option of having a specialist veterinary dermatologist (please see here: www.acvd.org) attend to Zoey. You can expect some combination of skin scrapings, cytology, bacterial culture and sensitivity, fungal culture, skin biopsy, intradermal or blood allergy testing, or presumptive hypoallergenic diet trials to be performed.

Please respond with further questions or concerns if you wish.

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Customer reply replied 1 month ago
Thank you
Dog Veterinarian: Dr. Michael Salkin, Veterinarian replied 1 month ago

You're quite welcome. Please continue our conversation if you wish.

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