The most common causes of pruritic skin disease in dogs are ectoparasites, cutaneous infections, and atopic dermatitis (canine atopic dermatitis, CAD), differentiated through a stepwise elimination process rather than a single diagnostic test.
Flea allergy dermatitis is the most common allergic skin disease in dogs, and flea infestation must be ruled out in every pruritic patient before attributing pruritus to other causes — diligent adulticidal flea prevention serves as both a therapeutic and diagnostic step.AAHA Clinical G… Ectoparasites and infections must be addressed before any allergic skin disease diagnosis is pursued.AAHA Clinical G…
CAD is a hereditary, predominantly T-cell-driven inflammatory skin disease characterized by pruritus as its primary clinical sign. In early stages, pruritus may occur without visible lesions; with progression, inflammation, erythema, excoriation, erosion, and self-induced alopecia develop, and chronicity produces lichenification with hyperpigmentation.Journal of Smal… The pathogenesis involves skin barrier abnormalities, allergen sensitization, microbial dysbiosis, and IgE responses to environmental allergens.Journal of Smal… Dysbiosis — characterized by reduced bacterial and fungal diversity alongside increased relative abundance of Staphylococcus and Malassezia pachydermatis — favors and enhances the intensity of atopic flares.Journal of Smal…
Cutaneous infections (bacterial and fungal) are both a consequence of and a contributor to pruritus, and must be identified and treated before the underlying allergic diagnosis can be accurately assessed.AAHA Clinical G… The 2023 AAHA guidelines recommend skin biopsy, topical fungal culture, and baseline lesion characterization — including assessment of pruritus, alopecia, and pain — as part of the integumentary diagnostic approach.AAHA Clinical G…
Pruritus itself shares neurophysiological pathways with pain, transmitted via slow-conducting unmyelinated C fibers at the dermo-epidermal junction, with histamine-sensitive mechanically insensitive C fibers playing a key role.WSAVA Global Gu… Chronic scratching provides temporary relief but perpetuates inflammation and can induce peripheral and central sensitization, further amplifying pruritus — making early intervention critical to breaking this cycle.WSAVA Global Gu…
The antipruritic drug classes with established evidence in dogs include systemic and topical glucocorticoids, antihistamines, ciclosporin, oclacitinib, and lokivetmab, selected based on the underlying diagnosis confirmed after ectoparasite and infection control.Veterinary Scie… The International Committee for Allergic Diseases in Animals (ICADA) guidelines and 2019 recommendations emphasize multimodal management of CAD: allergen avoidance, topical products, systemic antipruritic drugs, and allergen-specific immunotherapy.Journal of Smal…
Would you like a breakdown of how to select among oclacitinib, lokivetmab, and ciclosporin for a dog with confirmed atopic dermatitis?