Lowfat peanut butter
Wet food
Dry food
Chicken
Treats
Anything can go in there really, But I try to make it more difficult by sticking things at the very bottom rather than letting them just fall out.
Another good idea is the stuffable bones. I have about 3 of them for my 2 Lab Boxer mixes. I can fit a 2 handfuls of dry food in there along with wet food to make it harder. These are great because unlike Kongs, they are pretty much indestructible. I have had them for a year now and not a dent! You can get them at any pet store. They are shank bones, but there are some made much bigger |