4. Pomeranian

Although diminutive at a full height of 10 to 11 inches, Pomeranians didn't get the memo they're small dogs. Poms are spunky, fearless and highly intelligent, and they excel at obedience training. They may look like docile dogs, but Poms are scrappier than many other small dogs. They're terrific watchdogs, but they can also stir up trouble because they like to run with the big dogs. Yet, because they're so trainable, they also make great lapdogs.

5. Shih Tzu

Their sweet, loving demeanor makes the Shih Tzu (their name means "lion" in Mandarin) one of the most popular of all dogs, big or small, in the U.S. These athletic dogs are all muscle under their "glamorous" exterior, says the AKC, and they're high-performing in agility competitions. While Shih Tzus aren't great watchdogs like many of their small dog counterparts, they love their humans and make great companions.

When caring for a small dog, be sure to provide your little pup with the exercise, routine care and nutrition that's just their size.

Christine O'Brien Christine O'Brien

Christine O'Brien is a writer, mom, and long-time cat parent whose two Russian Blues rule the house. Her work also appears in Care.com, What to Expect, and Fit Pregnancy, where she writes about pets, pregnancy, and family life. Find and follow her on Instagram and Twitter @brovelliobrien.

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