Introduction

• Most congenital and hereditary conditions have been reported in small numbers, thus there is no detailed understanding of their heritability.
• In most conditions the animals should not be used for breeding.

Disorders of the surface and follicular epithelium

• Aplasia cutis.
• Benign familial chronic pemphigus Skin: benign familial chronic pemphigus.
• Dermoid sinus Skin:dermoid sinus.
• Ectodermal dysplasia (X-linked).
• Epidermal dysplasia of the West Highland White Terrier.
• Epidermolysis bullosa Skin: epidermolysis bullosa.
• Familial canine dermatomyositis Skin: familial Dermatomyositis.
• Footpad hyperkeratosis Skin: footpad familial hyperkeratosis.
• Hereditary lupoid dermatosis in the German Short-haired Pointer (exfoliative cutaneous lupus erythematosus) Skin:hereditary lupoid dermatosis.
• Hereditary zinc-responsive dermatosis Zinc responsive dermatosis.
• Ichthyosis Skin: Ichthyosis.
• Idiopathic ulcerative dermatosis in the Shetland Sheepdog and the Collie.
• Lethal acrodermatitis (Bull Terrier) Skin: acrodermatitis.
• Primary seborrhea Skin: seborrhea.
• Epidermal dysplasia of the West Highland White Terrier.
• Psoriasiform-lichenoid dermatosis in the English Springer Spaniel Skin: psoriasiform-lichenoid dermatosis.
• Schnauzer comedo syndrome Skin: comedo syndrome.
• Sebaceous adenitis in the Standard Poodle and other breeds Skin: idiopathic granulomatous ebaceous adenitis.
• Vitamin A responsive dermatosis Skin: vitamin A responsive dermatosis.

Disorders of hairs and hair growth - structural defects of the hair shaft

• Pili torti.
• Spiculosis Skin: spiculosis (Kerry terrier).
• Trichorrhexis nodosa.

Disorders of hairs and hair growth - congential hypotrichosis or alopecia

• Alopecic breeds ( Mexican Hairless Dog, Chinese Crested Dog, Inca Hairless Dog, Peruvian Inca Orchid, American Hairless Terrier, Abyssinian Dog, African Sand Dog, Turkish Naked Dog).
• Congenital hypotrichosis Skin: congenital hypotrichosis and alopecia.

Disorders of hairs and hair growth - tardive hypotrichosis or alopecia

• Alopecia X (follicular dysplasia of plush-coated breeds) Skin: alopecia X.
• Black hair follicle dysplasia Skin: Black hair follicle dysplasia.
• Color dilution alopecia Skin: color dilution alopecia.
• Follicular dysplasia.
• Pattern baldness Skin: pattern baldness.
• Recurrent flank alopecia, canine (season flank alopecia) Skin: idiopathic cyclic flank alopecia.

Disorders of hairs and hair growth - miscellaneous

• Melanoderma and alopecia in the Yorkshire Terrier Skin: melanoderma and alopecia (Yorkshire terrier).

Disorders of pigmentation - hyperpigmentary disorders

• Acanthosis nigricans Acanthosis nigricans.
• Lentigo.
• Melanoderma and alopecia of the Yorkshire Terrier Skin: melanoderma and alopecia (Yorkshire terrier).
• Nevi.

Disorders of pigmentation - hypopigmentary disorders

• Albinism.
• Canine cyclic hematopoiesis Cyclic hematopoiesis.
• Mucocutaneous hypopigmentation Skin: pigmentary disorders.
• Non-inflammatory nasal depigmentation.
• Piebaldism.
• Tyrosinase deficiency.
• Uveodermatologic syndrome Uveodermatologic syndrome.
• Vitiligo.
• Waardenburg-Klein syndrome.

Disorders of pigmentation - disorders of atypical coloration

• Acquired aurotrichia of the Miniature Schnauzer Skin: aurotrichia.
• Canine cyclic hematopoiesis Cyclic hematopoiesis.

Disorders of collagen

• Cutaneous asthenia Skin: cutaneous asthenia.
• Disorder of the footpads in the German Shepherd Dog.
• Focal metatarsal fistulation in the German Shepherd Dog.
• Multiple collagenous nevi.
• Nodular dermatofibrosis.

Disorders of vessels

• Familial vasculopathy.
• Lymphedema.

Miscellaneous

• Acral mutilation syndrome Skin: acral mutilation syndrome.
• Acrodermatitis Skin: acrodermatitis.
• Cutaneous mucinosis Cutaneous mucinosis.
• Ocular disorders.
• Tyrosinemia.

Diagnosis