According to Animal Planet, there are two different classifications of small dogs, with toy dogs weighing up to 11 pounds and small dogs weighing up to 22 pounds. There are many dog breeds in each of these categories.
The Chihuahua is a popular toy-sized dog. According to Animal Planet, the Chihuahua is an energetic dog who gets most of its exercise running around indoors. The Chihuahua enjoys short walks outside, but is not an outside dog. It weighs less than six pounds and has either a long or smooth coat. Another common toy size dog is the miniature pinscher. This is one of the most energetic of dog breeds, ranging from 8 to 10 pounds. A third toy-sized dog is the toy fox terrier. This is a hunting dog with a lot of energy, intelligence and the ability to easily learns tricks. The toy fox terrier weighs from 3.5 to 7 pounds.
One popular small dog breed is the dachshund. The dachshund is a long dog with short legs. For this reason, it is commonly known as the wiener dog. According to Animal Planet, this dog is curious and bold, but reserved with strangers. There are three types of coats for the dachshund: smooth, long and wire. They range from 11 to 32 pounds. Another popular small dog is the shih tzu. This breed has a very long, silky coat. The shih tzu is a lap dog, but also loves to play. The shih tzu ranges from 9 to 16 pounds.