TLDR A French bulldog had sparse hair due to a condition similar to that seen in Chinese crested dogs.
A case of congenital alopecia was reported in one female French bulldog from a litter of four, where the dog was otherwise clinically normal except for its sparse hair distribution, which resembled that of a Chinese crested dog. Histopathological examination of skin biopsies showed typical features of congenital alopecia, including a reduced number of hair follicles, hypoplasia or absence of epidermal appendages, and pronounced follicular hyperkeratosis, with no abnormalities in collagen and elastic fibers detected.
Low-dose oral isotretinoin improved hair loss and facial bumps in patients with a specific type of hair loss.
November 2019 in “Harper's Textbook of Pediatric Dermatology” Understanding normal hair growth and loss in children is key to diagnosing and treating hair disorders.
7 citations
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August 2018 in “The American Journal of Dermatopathology” Researchers found a new early sign of Frontal Fibrosing Alopecia that could help avoid misdiagnosis.
4 citations
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August 2016 in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology” Using cetirizine on the skin and taking vitamin D can help increase hair growth in children with hair loss from ectodermal dysplasia.
189 citations
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May 1991 in “Medical Entomology and Zoology” 
5 citations
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October 1988 in “Clinics in Dermatology” Minoxidil promotes hair growth but exact mechanism is unknown.
