I couldn't recommend the kongs more; my boxers love them. Dodger in particular, he will lay for hours with his, lovingly kissing and licking it! If you are after one exchange and mart do have a pet section so you might be able to pick one up for a bargain.
i have a mini kong for my rat, and she likes it!
but she is able to bite pieces right off with her little teeth so i let her play with it under close surveillance so she doesn't eat the pieces! she doesn't even need it filled with treats
I just use a little dish soap and a thing i found that looks kinda like a baby bottle brush at the Walls store here in town. Its not made by kong, but the package says its made to clean them and other toys, i think the brand name is bamboo or something, but it works great, its got a smaller brush inside the handle too. I bet a regular baby bottle brush would just as well, but we got lucky and found this one for a dollar! Here a link to what they look like. http://www.amazon.com/Bamboo-Cleani...?ie=UTF8&s=home-garden&qid=1216559244&sr=8-10
Kongs are one of the best toys around, my staffie goes through tennis ball and other toys in seconds!! then i got a Kong dog toy large, the red one, shes had it for 2 years now and it doesnt look like ever breaking! the only damage it has is bite marks but thats it, i highly recomend this for any big chewing dogs. Lola loves hers.
I am so glad someone has said how great Kong toys are, I feel the say way and my pets just love them which is why I decided to create my own website selling pet supplies and made sure that Kong was definately one of them! Check out my site...harleyspetshop.com!