Petco is know for their excellent customer support service among online pet supply retailers. You may get in touch with Petco's customer support any day of the week between 5 a.m. to 9 p.m. PST. Petco will only resolve customer support issues withing this timeframe so be sure to contact them early to get the fastest response. You may reach Petco customer support through a variety of means. You can email to open a new customer support ticket, go to the Petco website and chat with a service representative, or call 877-738-6742 to speak to a representative immediately.