PetSmart, Inc. is a retail chain operating in the United States, Canada, and Puerto Rico engaged in the sale of specialty pet supplies and services such as grooming and dog training, cat and dog boarding facilities, and daycare. PetSmart also offers a varied selection of animals for sale and adoption such as birds, fish, amphibians, reptiles, and several breeds of small animals like guinea pigs, chinchillas, gerbils, hamsters and mice.  Wikipedia