Boxers are one of the most popular breeds in the U.S. because of their playful, enthusiastic natures and dedication to their human companions. They have a great sense of humor and are quite cuddly, considering their stocky selves to be right at home on your lap—even when they reach up to 80 pounds! "They crave affection and attention. They love their people, they love to please, and are extremely intelligent and loyal," says breeder Marc Hatten, owner of Mountain Crest Boxers in Huson, Mont. "They want to be with their families to play, run, and romp, and are typically great with kids and other animals, especially if you get them as puppies and socialize them from an early age."