Abstract
Black hair follicular dysplasia (BHFD) is an unusual canine skin disorder defined as alopecia confined to black regions of the hair coat. First clinical abnormalities are usually noted around four weeks of age and comprise fracture of hair shafts in black-coated regions, later resulting in partial alopecia, usually, on the head, ear pinnae, neck, and back, whereas some nonblack-coated areas may exhibit normal hair. The diagnosis is confirmed by histopathologic features. This article aims to report a case of black hair follicular dysplasia in a seven-month-old Fox Paulistinha male dog showing alopecia restricted to black-haired areas, in which diagnosis was confirmed by histopathological exams that showed follicular dysplasia associated with melanic accumulation in the hair shaft and in and deep dermal tissue.
Highlights
Abnormalities in melanocytes have been described in the dog, occasionally associated with alopecia
Black hair follicular dysplasia (BHFD) is an unusual canine skin disorder defined as alopecia confined to black regions of the hair coat
This article aims to report a case of black hair follicular dysplasia in a seven-month-old Fox Paulistinha male dog showing alopecia restricted to black-haired areas, in which diagnosis was confirmed by histopathological exams that showed follicular dysplasia associated with melanic accumulation in the hair shaft and in and deep dermal tissue
Summary
Abnormalities in melanocytes have been described in the dog, occasionally associated with alopecia. Color-linked follicular dysplasias are linked to coat color They include color dilution alopecia (CDA) and black hair. Both CDA and BHFD ( known as ‘dark hair follicular dysplasia’) are primarily noninflammatory forms of truncal hair loss that occur in various breeds, mainly associated with certain coat colors (Muller & Kirk, 2013). BHFD in dogs was first described in 1972 as alopecia that is confined to black regions of the hair coat (Selmanowitz et al, 1972) It has been reported in a variety of breeds such as Bearded Collie, Saluki, Border collie, King Charles spaniel, Jack Russel terrier, and Gordon setter (Hargis et al, 1991; Bohnhorst et al, 2001). Analysis of the pedigree of a family of dogs with black hair follicular dysplasia has suggested an autosomal recessive mode of inheritance (Schmutz et al, 1998)
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