Keeps dog interested but easily goes under furniture

I like to give this to my larger younger dog who is food obsessed so it takes him longer to eat. I most of his food in his bowl and then a half a cup in here to slow down his eating and give my older dog who is a slow eater time to finish his food. My biggest issues with it are that it is difficult to clean after crumbs and such build up and it frequently gets stuck under furniture because of its small size.

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