In spite of the rising competition in the online pet market, Pets.com appeared to be on a road to success in the beginning of 1999. Sadly, the success never brought profits for the online firm and Pets.com decided to close its doors in November, 2000 just two years after its launch.

Petco. The largest pet supply companies in the United States are without a doubt PetSmart and Petco Animal Supplies. PetSmart, which is headquartered in Phoenix, Arizona, brings revenue in from brick-and-mortar stores across the U.S., as well as in Canada and Puerto Rico.