My 8month old English Mastiff puppy is as rambunctious as they come, and weighs 100 pounds to boot. The Kibble Nibble holds 3 cups of large chunk dog food in either end, and takes 30+ minutes of constant play and attention to empty. It's a great way to slow down those voracious eaters! Beware other reviews that say this is "not durable for large dogs"...it absolutely IS plenty durable for my large dog. This is a classic case of your-mileage-may-very. Do you have a large dog that pounces or stands on it's toys? This product may not hold up, I can't speak for that. My dog bats it around, crashes it against walls, picks it up and drops it, and many months later, not so much as a single crack. *However*...two very big flaws exist in this product, read carefully before purchasing online: 1. The words "treat meter" are misleading. This meter is not adjustable after the first time. It consists of small easy-to-cut soft plastic "prongs" that you snip off millimeter by millimeter until you get the desired dispensing size. You can make the hole larger, but you can never make it smaller. Ensure you're not cutting it too much at the start, the food should not pour out, but rather trickle out with movement. 2. My original Kibble Nibble became "locked" or stuck shut. Simply cannot open it anymore. Not sure how this happened...I've tried soaking it in a mild detergent, I've tried WD-40, and I've tried sheer braun arm-torque about a dozen times now. Plain and simple, it will not open. Loading 3 cups of food by hand one kibble at a time really isn't my idea of fun, so I ordered a new one and it just arrived in the same condition. Brand new, does not open. Period. My poor mastiff is staring at me holding it in my hands and wrestling with it, she whines and moans because she wants it THAT bad, but it just won't open. This would have recieved a 5 star rating from me were it not for this particular problem. My advice has to be that, if possible, one should buy this locally and not online, so you can make certain it actually opens when you buy it. Hope this review helps! **Edit** With nothing left to lose, before I pitched these into the garbage I tried one last thing. I dropped the ball onto the ground from about 10 feet in the air, and lo and behold the impact split the two sides apart, with no damage to the toy. Worked for BOTH of them! Still have to give this a 4 star rating though, what a pain in the rear! By the way, a large hollow hard plastic item being dropped onto a hard surface from 10 feet with no damage? If that's not durable, I don't know what is!!!!!!!!!