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Table 1 Important differential diagnoses for pruritic skin diseases in dogs

From: Canine atopic dermatitis: detailed guidelines for diagnosis and allergen identification

Ectoparasitic skin diseases Fleas
Scabies (Sarcoptes scabiei)
Demodicosis
Cheyletiellosis
Pediculosis
Otoacariasis (Otodectes cynotis)
Trombiculiasis
Nasal mites (Pneumonyssus caninum)
Microbial skin infections Staphylococcal pyoderma
Malassezia dermatitis
Allergic skin diseases Flea allergy dermatitis
Atopic dermatitis
Food intolerance/allergy
Insect bite hypersensitivity
Contact dermatitis
Neoplastic disease Cutaneous lymphoma