There is some good information on different kinds of interactive toys in a blog that we recently posted, called Why You Need Interactive Dog Toys.
Also, just so you know, we carry Kong Toys, including the Kong Classic. You can find them, and other interactive dog toys such as the Dura Doggie Nebo Toy and the Starmark Treat Dispensing Bob-A-Lot.
If you're looking for something eco-friendly, we also carry toys from West Paw Design. Their toys are super-tough and guaranteed to last. Take a look at their Zogoflex Tux Dog Toy.
Thanks for posting your question!