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The canned food is used exclusively in the kong when frozen, but you are free to be creative with whatever Bella prefers. Depending on the dog, if the Kong is made to difficult to empty they can become averse to the whole idea. Has she had exposure to learning to unstuff the kong (ie not just licking peanut butter , or getting loosely packed treats out)?
You may want to not fully freeze the first few kongs, so that it is more immediately rewarding. She will have more incentive to work harder on the frozen stuff if she has experience that it is eventually rewarding.
As for the bones, just the ends are coated to encourage chewing 🙂
