Pruritic dog Flashcards Preview

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Flashcards in Pruritic dog Deck (15):
1

indicators of pruritis

scratching
biting
licking/grooming
chewing
rubbing
head shaking
scooting

2

clinical signs associated with pruritis

erythema (inflammations), alopecia, excoriations, pyotraumatic dermatitis ("hot spots"). With chronicity: also hyperpigmentation, lichenification, acral lick lesions.

3

What the diagnosis/DfDx's?
- self-induced alopecia
- erythema, sclaing, hyperpigmentation, lichenification
- greasy skin & hair
- malodor
- ears, claw folds, mucocutaneous junctions affected

Malassezia hyper sensitivity

4

Pathophys of Malassezia hypersensitivity

M. pachydermatis is a normal skin commensal -> conditions allow for overgrowth (commonly allergic dermatitis) -> clinical signs

5

Impression smear and tape cytology of greasy skin shows organisms that look like footprints/snowmen/fat bowling pins. What is the Dx/DfDx?

Malassezia

6

treatment of Malassezia hypersensitivity?

Topical:
chlorhex (3-4%),
miconazole

Systemic:
keto-, itra-, flu- conazole (give with food)
Terbinafine

Preventative:
mousse, sprays, medicated wipes, shampoo daily-weekly
Address underlying cause!

7

Sarcoptic mange involves a ____ hypersensitivity

type I - IgE -> degranulation of mast cells & basophils -> allergic reaction that may progress to anaphylaxis

8

- Severe pruritis, not responsive to corticosteroids
- erythema, papules,
- self-induced alopecia
- excoriations, scale, crusts
Distribution of lesions: ventrum, pressure points, ears, legs.

With chronicity may see:
- lichenification
- generalized lesions
- systemic signs: lethargy, peripheral lymphadenopathy, inappetance

What is Dx/DfDx ?

Sarcoptic mange

9

Hx of contact with wildlife, or having an active outdoor lifestyle.
Marked pruritis, alopecia, erythema, skin lesions.
DfDx?

Sarcoptic mange

10

Treatment for sarcoptic mange/suspected

Selamectin, moxidectin (on label)
ELDU: ivermectin, isoxazolines, isoxazolines

antipruitics (mite die-off can cause increase in hypersensitivity

11

Flea allergy dermatitis can involve which type(s) of hypersensitivity reaction(s)?

type I (allergic, IgE mediated)
type IV (delayed, cell-mediated by T lymphocytes & macrophages)

12

pathophysiology of flea allergy dermatitis/ hypersensitivity dermatitis

fleas -> saliva glycoproteins recognized as antigens -> elicit immune response - Type I or Type IV hypersensitivity

13

Severe pruritis in "pants zone", over hind limbs, caudal dorsum and bum.
papules
chronic inflammation (erythema, lichenification, hyperpigmentation)
self trauma

Dx/DfDxs?

Flea allergy dermatitis

14

What is a key feature of localization of flea allergy dermatitis?

pants zone!

15

treatment of flea allergy dermatitis

Flea prevention/control
- adulticide with fast speed of kill
- may also use IGR's but cannot use IGRs alone

topical:
imidacloprid, fipronil, indoxicarb, dinotefuran q 3weeks
imidacloprid collars

systemic: spinosad, nitenpyram,
afoxo-, flu-, saro-laner

Environment: may need to clean carpets; but usually excellent control via the animals is enough