Puggles have been around since the 1980s, the result of mating pugs and beagles. Breeders try to bring out the best qualities of the two originating breeds, carefully selecting genetic lines over time. However, genetics and results aren't always predictable, so remember that generalizations about puggles are just that.
Beagles and pugs are small breeds with short, straight, low-maintenance coats, and puggles are the same. The crossbreed typically reaches 10 to 15 inches high at the shoulder and around 20 pounds when fully grown. Ideally, puggles have the outgoing, friendly personality of pugs, but sometimes they have the more standoffish and independent nature of beagles. Both parent breeds are stubborn, though, and heavy shedders, so expect the same from a puggle.
A Word of Caution
Puggles are highly profitable for puppy mills and irresponsible breeders, and many purchases support breeders who mistreat animals. Research breeders offering puggles thoroughly, tour their facilities, ask questions to find out how knowledgeable they are and -- while you want evidence of health screenings in parents and offspring and a written guarantee of good health -- don't deal with any breeder who guarantees a puppy will never develop health problems.