Blanket: The color of the coat on the back and upper part of the sides, between the neck and the tail.

Blaze: A white stripe running up the center of the face usually between the eyes.

Blenheim: Used to define the color of markings of the Cavalier King Charles Spaniel (red and white). Color definitions may vary by breed. Always check the breed standard for the definitive color description.

Blinking: Briefly pointing a bird and then leaving it, or upon finding a bird, avoiding retrieving it.

Bloat: Also known as gastric dilation, a flatulent digestive disturbance of domestic animals and especially cattle marked by abdominal bloating. Most common in deep-chested dogs and can rapidly lead to death if untreated.

Blocky: Square or cube-like formation of the head.

Blocky head: A head with a squarish, cube-like appearance. Seen on the Boston Terrier.

Blooded: A dog of good breeding; pedigreed.

Bloodhound: One of a breed of hounds with a smooth coat, drooping ears, sagging jowls, and a keen sense of smell.

Bloodline: Direct line of descent; pedigree.

Blue Gray: Color definitions may vary by breed. Always check the breed standard for the definitive color description.

Blue-cream: A coat color combining blue with cream.

Blue Merle: A color pattern of black blotches or streaks on a blue-gray background. Color definitions may vary by breed. Always check the breed standard for the definitive color description. See Merle

Bluies: Colored portions of the coat have a distinctive bluish or smoky cast. This coloring is associated with extremely light or blue eyes and liver or gray eye rims, nose, and lip pigment. Color definitions may vary by breed. Always check the breed standard for the definitive color description.

Blunt Muzzle: A square muzzle typical of many breeds such as the Mastiff and Pointers.