I moved to Park Slope back in 1994, and have used these guys since. Small shop, but has everything you would need or want. Great selection of quality food for cats, dogs and birds, and the prices aren't bad at all either. Plus the guys who own it have been doing it for so long, so if you have a question they would be the ones you would want to ask. With other stores like Petco, or whatever opening up all over the place, these guys are still around and still doing well. So they are doing something right. Best of all, DELIVERY!!! It's a great option for those days that you just can't make it to the store. Which isn't bad because you can enjoy the parkside and Grand Army plaza on the walk there. Besides, I would rather pay the delivery guy a tip than resort going to the shady one over here closer to my place (remain nameless).
Pros: Delivery! Knowledgeable Employees, Great Food Selection