| I use the Kong peanut butter mixed with kibble, fill the whole thing up, then freeze it. It doesn't make much of a mess frozen since the dog licks it as it thaws.
I handwash mine (no dishwasher here). When Red's done with it, I rinse it out, and sometimes let it soak in the dishwater. Then I just cram the dishrag into it twist it around, clean the holes with my fingers, and viola! Done!
I use the King (size) Kong for stuffing, btw. The bigger Kongs are easier to clean. |