Dogs of the working group tend to be big and bulky, bred to herd and guard, to guide and rescue. Two giant and one not-so-giant mushballs emerge at the top of this category.

Boxers have a menacing look that is deceptive: they love to play and have a particular fondness for children. When choosing any dog that has been bred for aggression at one time, be very careful to use a knowledgeable, honest breeder when you go to buy a boxer.

Newfoundlands, which can weigh in at 200 pounds, win high marks for even temperament and kindness with children. A Newfies a real presence, says one vet, a very sweet monster of a dog who tends to drool a lot. Newfoundlands belong in cold climates and need lots of activity (even though they may act like they would prefer to stay on the couch all day).

Samoyeds round out this category. Do not go look at a litter of Samoyed puppies until you have definitely decided you want one: they are irresistibly bouncy, fuzzy little snowballs that grow into wonderful childhood playmates. They require patient handling and persistence (they are not famous for trainability), and are not suited for apartment life. Regular grooming is a must, and some Samoyeds tend to be barkers.