What is the pathogenesis of FAD (flee allergy dermatitis)

- Injection of salivary proteins (haptens)

- Combination of hapten with collagen to form antigen

- Hypersensitivity insues

What type of hypersensitivity occurs with FAD?

Type I

Type IV

Cutaneous basophilic hypersensitivity

Late phase reacion

Where anatomically are the physical findings noted?

Dogs: dorsal lumbar area, caudal aspect of rear legs, ventrum

Cats: similar or reaction patterns (miliary dermatitis or eosinophilic dermatitis)

How long should an animal be treated for FAD with glucocorticoid?

Treat for 3-4 weeks to allow flea control to establish

What type of hypersensitivity is a food allergy?

Type I and IV

What are some differential diagnoses for adverse food reactions excluding hypersensitivities?

1) Food intolerance (dif b/c they can occur on first exposure)

2) Idiosyncratic adverse reactions 

3) Pharmacologic reaction

4) Food poisoning

What are common food allergens for dogs and cats?

Beef, dairy products, poultry products, corn, soy.

Dogs: wheat 

Cats: FISH

True or false: Food allergies are typically noted when there is a dietary change

False, most typically associated with a diet the animal has been on for weeks or months

What physical findings would you expect in a dog food allergy?

Face rubbing, foot licking and generalized pruritis

Otitis externa

Recurrent superficial pyoderma or folliculitis

Interdigital pyoderma

Physical findings for cat

Facial dermatitis

Otitis externa

Miliary dermatitis

Eosinophilic dermatitis

Self induced alopecia

What should you base diagnosis on?

- Clinical features

- Hypoallergenic diet (8-12weeks animal should get 50%)