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Atopy Flea Allergy Food Allergy Notes

Veterinary Medicine Notes > Small Animal Internal Disease - Skin Notes

This is an extract of our Atopy Flea Allergy Food Allergy document, which we sell as part of our Small Animal Internal Disease - Skin Notes collection written by the top tier of University Of Veterinary Medicine And Pharmacy Of Kosice, Slovakia students.

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4. Atopy, Flea Allergy, Food Allergy ATOPY :
= Canine atopic dermatitis; Canine allergic inhalant dermatitis; Canine atopic disease.

* Atopy is a genetically predisposed inflammatory and pruritic allergic skin disease

* Characteristic clinical features

* Associated with IgE ab to environmental allergens

* Dogs - skin disease with orcasional organ involvement

* Cats - also devp. Dermatitis also but may also have asthma like respiratory problems

* Atopy is reported to account for 8-30% of canine skin diseases. o The prevalence in the cat population is much lower. Etiology IgE mediated Type 1 Hypersensitivity Contributing factors:

* Environmental Allergens

* Staph. Pyoderma

* Malassezia dermatitis

* Concurrent flea or food allergy

* Temperature and humidity Age and sex predeliction

* First seen between 6mths-3yrs (rarely develops in dogs >7yrs

* No sex predeliction but females reported to be more commonly affected Breed Predeliction

* Dogs : Boxer, Boston terriers, Cairn terrier,Sharpei, English bulldogs, English/Irish setters, golden retrievers/labradors, WHWT, fox terriers, yorkies

* Cats - not been reported Seasonal Incidence - initially seasonal but progresses to non-seasonal Clinical Signs in Dogs AD should be considered as a dif. Dig. in any dog with:

* Pruritis

* Recurrent staph or malassezia dermatitis

* Otitis externa Pruritis - Initial and most outstanding C.S. in dogs and cats

* Pruritus may be the only sign in some dogs.

* Most of the lesions observed are secondary to self-trauma.

* Pruritis on one or more of the following: Face, ears, ventrum and distal limbs (can become generalized)

Skin Lesions

* Currently a lot of debate on pathognomic lesions for AD. (assuming 20 lesions aren't present)

* Some dogs have no primary lesions

* Others - Rash (macular/popular dermatitis)

* Chronic self trauma leads to 20 lesions - alopecia, lichenification, hyperpigmentation, seborrhea

* Secondary pyoderma common - staphylococcus intermedius or Yeast dermatitis -
Malassezia pachydermatis.

* Otitis externa - common in dogs with Ad

* Concurrent signs of fleas and flea allergy dermatitis are present in many patients. Clinical Signs in Cats

* Pruritis - Hallmark

* Other symptoms in cats are not like dogs

* Pruritis in cats may manifest as symmetric alopecia, military dermatitis or part of the eosinophilic comples lesions

* 20 bacterial or yeast infections or otitis less common Diagnosis : Diagnosis based on:

* Typical historical features

* Characteristic C.S.

* Exclusion of differential diagnoses Diagnostic Approach Step 1

* Dx. And Tx. 20 infections

* Dx. And TX concurrent flea allergy

* Dx. And tx scabies Step 2

* Confirm that the 20 infection, flea allergies and scabies are ruled out

* Determine that residual pruritis remains

* If pruritis is seasonal and flea allergy has been ruled out = AD

* If pruritis is non-seasonal, carry out a food trial to rule out food allergy Step 3

* If food trial eliminates the issue = food allergy

* Partial response with food trial - Food allergy and AD likely

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