Robust
I have a staffy/lurcher cross who is a very destructive strong chewer. Her strong jaws can destroy most toys. She has two of these. One almost two years old has serious injuries but still is played with. It’s hollow and squashy abit like a space hopper. I got the XL and it’s the best toy I’ve ever bought. It’s not indestructible. It has outlasted most other toys and she loves it.