Petzfunny Pet Feeder Toys Interactive Dog Cat Toy for IQ Treat The diameter is 10cm(4 inch), the height is 15cm(6 inch), it's suitable for your dogs. The material is ABS, it's stronger than common plastic. Don't worry, your lovely dog will not crush it easily. Tumbler style, you can put some food into it, when your dogs touch it, food will fall out. It's not only a wonderful toy for your dogs, but also a pet feeder, it will save your time. The advantage is exercise pet IQ, reduce anxious mood and diet control.