I bought one of the big Kong wobbler
toys for Russell, but never got around to trying it out. Russell is at his breeder's right now, and the girls are moping around without him, so I found the wobbler, filled it with kibble and set it down in the entryway.
After poking it with her nose for awhile, Carly finally figured it out. OMG, the two of them are kicking it all over the place, kibble flying. They are having the best time. I am definitely going to find more kibble toys. Apparently its even more fun if you stuff it under the chair in the living room, and then spend 15 minutes digging it out.