Petco Animal Supplies is privately held pet specialty retailer in the United States, with corporate offices in San Diego and San Antonio, that sells pet specialty products and services, such as grooming and dog training. Petco also offers a mainstream assortment of animals for sale and adoption, including fish, reptiles, small birds and small companion animals, such as hamsters, guinea pigs and mice. This article is a . You can help My English Wiki by expanding it.