A pet supply store is a retail space whose primary wares consist of objects to be purchased for the benefit of domestic animals, including food, toys, treats, beds and cages, cleaning supplies, and other pet-related accessories. If the store also sells actual animals as pets, then it should be listed as a pet store and not a pet supply store (as most pet stores also carry pet supplies).

The goods are purchased for domestic animals and can include food, housing, or care supplies. The store's principal merchandise consists of those goods.

Selling the animals themselves brings the store within the pet store definition above. A broad selection of accessories does not replace that distinction, because pet stores commonly carry supplies too.