My dog Ylvi (Schäfermix, 11kg) loves her Kong about everything! From the normal food bowl would "inhale" their dry food downright - to empty their Kong needs before an hour or more! The Kong is an ideal way to deal with fidgety dog food. We incidentally have several Kong's in use, eventually one can also play with it just fine, because he quite uncontrollably jumps away when you throw him and the chasing is just great fun for Ylvi! Filling: I always start with a few pieces of dry food (cheese glued at the bottom is to remove even for a clever dog tongue hardly ...). This is followed by cheese (sliced cheese or cheese corners - both Light) - nice smear on the walls and then every now and then dry food - cheese - dry food - to the Kong is full. The size L is actually rather too large for Ylvi. However, I have begun, just like reinzupacken to overfeed a lot of vegetables such as grated carrots or (along with cheese and dry food) and thus can compensate for the volume quickly without the dog. For cleaning you can put the problem into the dishes Kong players.