To help people better understand Bulldog coat color here are some examples of them!

Color of Coat -- The color of coat should be uniform, pure of its kind and brilliant. The various colors found in the breed are to be preferred in the following order: 1. red brindle; 2. all other brindles; 3. solid white; 4. solid red,
fawn or fallow; 5. piebald; 6. inferior qualities of all the foregoing.

Note: A perfect piebald is preferable to a muddy brindle or defective solid color. Solid black is very undesirable,
but not so objectionable if occurring to a moderate degree in piebald patches. The brindles to be perfect should
have a fine, even and equal distribution of the composite colors. In brindles and solid colors a small white patch
on the chest is not considered detrimental. In piebalds the color patches should be well-defined, of pure color
and symmetrically distributed.

Bulldog Coat Color Chart with pictures
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Thanks Sue for the work on this link!
RED
RED and WHITE
RED BRINDLE and WHITE
RED and WHITE / Black Markings
RED BRINDLE PIEBALD
RED PIEBALD
RED with BLACK MASK
Note:To be a true black mask, the pup MUST be born with black nose and muzzle. If not,
and the muzzle turns black as the dog gets older, then it is referred to as just a black muzzle.
FAWN and WHITE
FAWN with BLACK MARKINGS
WHITE
DARK BRINDLE
BRINDLE / BLACK MASK
BRINDLE PIEBALD
BRINDLE and WHITE
Brindle
FAWN BRINDLE PIEBALD