The Rogz Gumz ball is a new ball that we got Dakota. He loves to play ball and this looked pretty sturdy when we saw it in Paws pet store a few weeks back. We had bought a Rogz collar for Dakota when he was a puppy and loved the brand. Just like the collar we bought, the Gumz ball is well-made and definitely dog proof.
The Gumz ball serves several purposes as a dog toy. You can use it as a bounce and fetch play toy, or it can be used as a treat retriever toy. The center is hollow. Their website shows putting kibble in it. Small kibble would easily fall out of it if that is how you want to use it. Since it is made from a sturdy nontoxic thermoplastic rubber (TPR), I don't think a dog would actually ruin the ball trying to get a treat out. It has a bite-o-meter of 4 which is hard. We just use it as fetch toy with Dakota.
It comes in small, medium, and large sizes and a variety of colors. The Rogs headquarters is located in Cape Town, South Africa. They now sell many pet products so you should checkout their website to see where Rogs products are sold near you, or you can buy products online. Here is the online Rogzstore for the USA.