I want to start feeding the dogs at least 1 meal from a dispensable toy so that it takes longer and they aren't wolfing their food down in 1 minute. The problem I am having is finding a good one. They are both eat Blue Buffalo and the food is really small. Most of the dispensables that I have found the wholes are so big I don't think it would be much of a challenge to get the little bits of food out of the toy. Is there anything out there suitable for a medium/large dog that would take awhile? Even the Kongs have a large opening.