Pros
Got to bring your pets to work and play with other people's pets. Decent employee discount and special promotions.
Cons
You'd think that a company whose slogan was "Healthier Pets, Happier People, Better World" would have a great culture, but no. Petco has a very old school, highly structured, soul-sucking culture. Executives pass directives down through middle management and rarely address employees directly. There were no opportunities for advancement and management had no interest in mentoring or developing talent. I saw many instances of highly questionable ethics throughout all levels of management. Very poor communication and cooperation between departments and even within departments, for that matter. They would often assign completely unrealistic workloads and expectations so certain individuals would either quit or be terminated for cause (cheaper than paying severance when their job gets exported out of state or to an overseas call center).