The Chihuahua is the smallest of all dog breeds. Teacup Chihuahuas can be as small as seven inches high but they can also be as high as 15 inches tall. They will rarely weigh more than 6 pound . There are two types of coat known to this breed. They may have a long coat in which their fur will be thin or they may have a dense coat with very thick fur. The Chihuahua coloring may be varied. The most common color is tan which often has hues of silvery grey in it. They may even be spotted. The Teacup Chihuahua or even a small regular Chihuahua can easily become cold, which explains why their owners will often buy them coats or even knit them sweaters.