Recently I blogged the Treat Triad, a puzzle my dogs love. Another toy that keeps them focused and busy with something other than me is this crazy treat dispensing purple egg, the Busy Buddy Kibble Nibble.
The dogs bat it around and as it rolls, occasionally pieces of dog food roll out. My dog Pretzel plays football with it (American soccer) while Nemo just picks it up and drops it. He has learned that dropping it from higher altitudes allows the toy to accelerate a bit more, and that the additional kinetic transference dispenses extra treats. No, really.
I left the sound on in this video so you can hear that on hardwood floors, the toy is a bit loud. It does have rubber ribbing to keep it from destroying the floors, but I would not suggest filling the Kibble Nibble and then expecting peace and quiet.