Collies have a merle coat and a black body with a white chest, snout, and legs, similar to the Australian Shepherd.
White Great Danes are very unusual since they result from the presence of two merle genes in a Great Dane youngster.
The red merle dog has red spots on a beige background, while the blue merle dog has black patches on a grey background.
However, the Dapple Dachshund exists as a synonym for the merle in the world of sausage dogs.
The merle gene, as suggested by the name, gives this breed a coat similar to a leopard's.
The blue merle French Bulldog is the rarest of all Frenchie colours, which are most often brindle, white, fawn, or tan.
The cryptic merle, which carries the merle gene but otherwise appears classic; and the merlequin, which has merle patches on an otherwise classic coat pattern.
Merle variations of this breed are pushed as a "unique" designer colour, which upsets breeders who value excellent health and desirable traits above money.
Even though sable, brindle, black, grey, and red may all appear in a merle Cardigan Welsh Corgi, the prevailing blue colour is what distinguishes this breed.
The breed comes in black, red, chocolate, cream, fawn, and lilac, with red and chocolate merles and black and grey blue merles.