I like Mounds quite a bit. I recently adopted a dog from the humane society and was in need of some high quality pet items.
Out of all the stores in town that I checked, Mounds was the only one that carried Froms pet food. They also had the best variety of puzzle toys for dogs to stimulate their mind, as well as, a HUGE selection of rawhide and animal parts.
The entire story has a huge selection of different pet products. It definitely has a dark warehouse feel to it, but hey, it's in the title so I'm not sure if I can really complain. Everyone at the store was very helpful, and I was happy with the direction they provided.
While it is a little pricier than other stores, you are paying for the great selection. I do think it can be a little better organized, but at least the personnel are friendly enough to direct you toward what you need. If you have a pet, this is the Madison store you should check out.