The Toy Bulldog was a British type of miniature or toy bulldog in the nineteenth and early twentieth centuries. It was not recognised as a breed and is extinct. It was a miniature version of the Old English Bulldog, and derived from it either when natural small-sized sports were whelped from full-sized parents, or through systematic selective breeding for small size. A breed society, the Toy Bulldog Club, specified that the dogs should have the features and morphology of the full-sized bulldog, but with a weight not exceeding 9 kg (20 lb).
Image credit: W.D. Drury, Public domain
Adapted from Wikipedia, CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Toy_Bulldog