I'm aware that guinea pigs cant use traditional wheels because their spines don't bend that way, but what if got a couple and gave them a 12 inch flying saucer (disc wheel)? I am not gonna be able to let them roam free at all without them getting into trouble so I'm thinking if i get them this and put them in a little playpen, they'll have a flat surface to run on to get the exercise that way. Opinions of this welcome, I've never had guinea pigs before, Thanks!
http://www.amazon.coIm/Ware-Plastic-Flying-Exercise-12-Inch/dp/B001AT62G6/ref=cm_cr_pr_pb_t