Petco primarily sells small companion animals, reptiles, birds, and aquatic life. Typical offerings include ( Dwarf , Roborovski , and Syrian ), guinea pigs , , and .

Many stores have permanent in-store cat habitats where rescue cats are available for adoption.

A variety of geckos (such as Leopard geckos ), (like Ball pythons ), and various are frequently stocked.

Many locations sell small birds such as parakeets ( budgies ) , finches , and sometimes larger species like cockatiels or conures .

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While Petco is widely known for its vast selection of pet supplies, the actual animals available for purchase vary by location and are subject to specific corporate policies regarding animal welfare. This "paper" outlines the types of pets commonly available at Petco, the purchasing process, and the ethical considerations surrounding pet store acquisitions.

In 2024, Petco officially stopped selling rabbits to encourage adoption from specialized rescues due to the high rate of rabbit abandonment. The Purchasing Process