Below are some User Tips for you This interact food toy for dogs only support kibbles less than 0.47inch. Larger kibbles may not get through the hole. Please only use dry treat. Wet treat doesn't work for this tumbler toy. When unboxing this food toy for dog and cat, please tear the fixing tape on the wheels. When open the barn on this dog stimulate toy, please press the barn lid with force and then slide. Otherwise you may find it hard to open the door. This behavior training dog toy can NOT be used as a dog bowl. It is only aimed at the dogs will have more fun eating and cultivate the behaviour to eating slowly. This toy will not hold many dog treat. You may need to add several times treat in a meal.