Boston terrier; photo by Daybis on Flickr (noncommercial use permitted with attribution).
Official State Dog of Massachusetts
The Boston terrier (Canis familiaris bostenensis) was designated the official state dog of Massachusetts in 1979 (Massachusetts also recognizes a state cat). All State Dogs & Cats
A cross between an English bulldog and an English terrier, the Boston terrier was the first "purebred" dog developed in America (1869). The Boston terrier is a delight - very intelligent and full of energy. Friendly and sensitive, Boston terriers are eager to please and easy to train.