I ordered two of these. I thought "The Game" would be a great way to feed my dogs while stimulating their brains. One dog is almost 5 years old, male and 50 lbs (super lazy, not the brightest, but we adore him). The other dog is 3.5 years old, female and 40 lbs (We call her the wildebeest, if that gives you any idea! She's also diabolically smart). Both dogs are heeler mixes. 

The older dog manages to get his "Game" open every single time. Fortunately, it is usually toward the end when there aren't too many pieces of kibble left, but the concern is chewing/destruction of the product. The other enjoys hers but eventually gets bored which is very unlike her. 

I have been unable to use "The Game" adequately as feeders which is fine. The dogs still enjoy playing with them. The design could use a little more work, and the price is really high for what you get. I have other feeder/IQ toys that are just as effective and cost much less.