Toy dog traditionally refers to a very small dog or a grouping of small and very small breeds of dog. Toy breeds might be short on size, but they are definitely not short on personality. Breeds in the Toy group are affectionate, sociable and adaptable to a wide range of lifestyles, they are smart full of energy and many have strong protective instincts. Toy dogs are popular with city dwellers because they make ideal apartment dogs and terrific companions.