The Boston Terrier is a breed of dog originating in the United States of America.

Apperance
Boston Terriers are typically small, compactly built, well proportioned, dogs with erect ears, short screw-tails, and a short muzzle that should be free of wrinkles. Boston terriers can weigh from 10 to 25 lbs, typically in the vicinity of 15 lbs. Boston Terriers usually stand 15-17 inches at the withers. Boston Terriers usally have a square sort of face.

The Boston Terrier is characteristically marked with white in proportion to either black, brindle, seal, or a combination of the three. Seal is a color specifically used to describe Boston Terriers and is defined as a black color with red highlights when viewed in the sun or bright light.

Ideally white should cover its chest, muzzle, band around the neck, half way up the forelegs, up to the hocks on the rear legs, and a white blaze between but not touching the eyes. In show dogs, symmetrical markings are preferred. Due to the Boston Terrier's markings resembling formal wear, in addition to its refined and pleasant personality, the breed is commonly referred to as the "American Gentleman." The breed is known for its gentle, alert, and intelligent expression.

Frequently, variations on the standard are seen depending on the ancestry of the individual dog. At various times, the English Bulldog, English Mastiff, Staffordshire Bull Terrier, and French Bulldog—among other breeds—have been crossbred with Boston Terrier lines to minimize inbreeding in what is necessarily a small gene pool.

Temperament
While originally bred for fighting, they were later down bred for companionship. The modern Boston Terrier can be gentle, alert, expressive, and well-mannered. Many still retain the spunky attitude of the typical terrier. It must be noted however, that they are not considered terriers by the American Kennel Club, but are part of the non-sporting group. Boston Terrier is something of a misnomer. They were originally a cross-breed between the White English Terrier (now extinct) and an English Bulldog.

Some Bostons enjoy having another one for companionship. Both females and males generally bark only when necessary. Having been bred as a companion dog, they enjoy being around people, and if properly socialized get along well with children, the elderly, other canines, and non-canine pets. Boston Terriers can be very cuddly, while others are more independent.

Healt
Several health issues are of concern in the Boston Terrier: cataracts (both juvenile and adult type), cherry eye, luxating patellas, deafness, heart murmur, and allergies. Curvature of the back, called roaching, might be caused by patella problems with the rear legs, which in turn causes the dog to lean forward onto the forelegs. This might also just be a structural fault with little consequence to the dog. Many Bostons cannot tolerate excessive heat and also extremely cold weather, due to the shortened muzzle, so hot or cold weather combined with demanding exercise can bring harm to a Boston Terrier.

They can live up to 15 years or more, but the average is around 13 years.

The Boston, like other short-snouted breeds have an elongated palate. When excited, they are prone to a "reverse sneeze" where the dog will quickly, and seemingly laboriously, gasp and snort. This is caused by air or debris getting caught under the palate and irritating the throat or limiting breathing. "Reverse sneezing" episodes won't hurt a Boston in the least, but it will scare the dog, and maybe its owners, a good deal. The quickest way to stop these episodes is to talk to them calmly, and cover their nose with the palm of your hand, which will force the dog to breath more slowly and deeply through its mouth.

Because of their short snouts, they do tend to snort and snore. These can be signs of serious health issues. Due to the Boston's prominent eyes, some are prone to ulcers or minor injuries to their cornea.