Fig 1. Clinical and histological phenotype of Greyhounds with BTS.
(a) Affected dog with alopecia on the caudal and lateral thighs extending below the lateral hock area; (b) Affected dog with alopecia on the caudal and lateral thighs, the lateral hind leg down to the hock, the ventral abdomen and the ventral chest; (c) Normal telogen HF; (d) Telogen HF with an increased amount of trichilemmal keratin at the proximal end of the follicle. The more distal part of the HS is not anchored by trichilemmal keratin; (e) Horizontally broken telogen HF, which is not anchored by trichilemmal keratin and abundant keratin at the base of the follicle.