Allergic Skin Disease of Dogs & Cats Flashcards
Predominant clinical sign of allergic skin disease
pruritis
4 Major allergic skin diseases
- Flea allergy dermatitis
- Atopic dermatitis
- Food allergy
- Contact allergy
Food allergy occurs at what age?
- < 1 year of age
2. Old dogs
Atopy occurs at what age?
1-3 years of age
When do you see atopy symptoms?
Seasonally
When dod you see food allergy symptoms?
Year-round
The distribution of clinical lesions is key for developing a suspicion of what allergic skin disease?
Flea allergy dermatitis
The distribution of lesions are identical for what two allergic skin diseases?
Food Allergies & Atopy
How do you diagnose Atopy?
ruling out other diseases (NOT by intradermal or serum allergy testing)
Signalment: Flea allergy dermatitis?
No age predilection; usually over 6 months of age
Signalment: Atopy?
1-3 years
Many breeds including: West Highland White Terrier & English Bulldog
Signalment: Food allergy?
- < 1 year
2. Old patients
Signalment: Contact allergy?
No age predilection
Seasonality: Flea allergy dermatitis?
BOTH
- Seasonal
- Non-seasonal
depending on geography!
often in warm weather
Onset of clinical signs: Flea allergy dermatitis?
Rapid onset
Seasonality: Atopy?
BOTH
- Seasonal - grass pollen in summer
- Non-seasonal - house dust mites
* some patients may show signs year round but exhibit worsening signs during particular months*
Onset of clinical signs: Atopy?
Gradual onset
often starts in summer
Seasonality: Food allergy?
Non-Seasonal = ALL YEAR ROUND
Onset of clinical signs: Food allergy?
Gradual onset
occasionally more rapid
Seasonality: Contact Dermatitis?
BOTH
Seasonal & Non-seasonal depending on what px is allergic to
Onset of clinical signs: Contact allergy
Rapid onset
Which allergic skin disease may OR may not be pruritic?
Food allergy
Which allergic skin disease(s) is always pruritic?
- Flea allergy dermatitis
- Atopy
- Contact Allergy
Common lesions of all allergic skin diseases?
- Excoriation
- Alopecia
- Erythema
- Hyperpigmentation
- Lichenification
Dog Lesion location: Flea allergy dermatitis?
Caudal half of body:
- Dorsal lumbosacral region
- Tailbase
- Perineum
- Thighs
- Umbilicus
Dog Lesions of Flea allergy dermatitis are NOT usually found where?
Ears
Dog Lesion location: Atopy?
- Face
- Paws
- Distal extremities
- Ears
- Ventrum
Dog Lesion location: Food allergy
- Face
- Paws
- Distal extremities
- Ears
- Ventrum
* Same as Atopy*
Dog Lesion location: Contact Allergy?
Usually hairless areas that readily come in contact with the environment:
- abdomen
- muzzle
- ventrum of paws
Dog Lesions of contact allergy are NOT usually found where?
Ears - unless contact allergy is to ear medication
Dog Primary lesions of Contact allergy?
- Vesicles
2. Papules
What lesions do CATS present with for allergic skin diseases?
- Can present with same lesions as dogs
OR
- Reaction patterns
- Miliary dermatitis
- Eosinophilic granuloma complex
What lesions make up miliary dermatitis in cat?
diffuse crusted papules
What lesions make up the Eosinophilic Granuloma Complex in the Cat?
- Indolent Ulcer
- Eosinophilic Granuloma
- Eosinophilic plaque
Eosinophilic Granuloma Complex:
Indolent Ulcer
- what is it?
- where is it?
- ulcerative symmetrical lesion
2. on the upper lip
Eosinophilic Granuloma Complex:
Eosinophilic Granuloma
- where is it?
found in mouth or body
Eosinophilic Granuloma Complex:
Eosinophilic Plaque
- what is it?
- where is it?
- linear plaques
2. on caudal thighs
CAT lesion location: Flea allergy dermatitis?
- caudal dorsal
OR
- Face & neck
* Symmetrical Alopecia*
