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Pomeranian
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When full-grown, Pomeranians weigh between 3 and 7 pounds. Don't let him know he's tiny -- the smallest of the spitz breeds, Poms think of themselves as big guys. These happy, active, personable little dogs do well in canine competitions, such as agility. They're also decent watchdogs, although they can overdo the barking. Poms do require regular grooming of their thick, double coats.
Maltese
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The elegant, white Maltese weighs in between 4 and 7 pounds. Playful and energetic, this breed has served as a companion dog since ancient times. While a Maltese doesn't need much exercise, he does need his long coat brushed several times a week, along with regular shampooing to keep him clean.
Chihuahua
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The classic little Chihuahua can't exceed 6 pounds at maturity, according to the Chihuahua Club of America breed standard. You can choose from smooth or long-coated varieties. Devoted to their person, Chis might not get along with other family members.
Yorkshire Terrier
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Originally bred in the north of England to hunt vermin, the Yorkshire terrier might not realize he weighs 7 pounds or less. His feisty nature might make him think he can take on bigger dogs, so avoid trouble when out for a walk. He's a true tiny terrier, inquisitive and determined. Unlike other terriers, he usually gets along well with cats and smaller house pets. His long coat requires regular combing and professional grooming.
Other Toy Breeds
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Many of the other toy breed standards don't decree a maximum weight, but do include height restrictions. Other toy breed standards impose maximum weights up to 18 pounds. Some of the other small toy breeds include the poodle, considered smart, loyal dogs whose coats might not affect people with allergies; the Chinese crested, available in hairless and "powder puff" versions; the alert, active papillon; the bold, brave miniature pinscher, dubbed the "King of Toys" and the child-friendly, good-natured English toy spaniel.
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Puppy Breeds That Stay Small
There's nothing more fun than a box full of puppies. Wouldn't it be wonderful if they didn't grow up, but stayed that size forever? Certain toy dog breeds do grow up, but they don't get big. At maturity, they won't weigh more than 7 pounds.