Blue Pitbull Koni snaps cable

Our "puppy", Elekoni, has snapped another cable. When we are not home, sometimes we hook him up to a 30+ foot cable. He's snapped 3 of these so far. I know you're thinking that it's probably the clip/hook/connecting hardward that broke, but it's not. The actual cable broke in two. We recently found a pet store that carries much thicker cables than the pet store that we usually go to, so I think we'll be picking up one of those. Unfortunately the snapped cable was thrown away so I can't take a picture of it to show you.

I wonder what it is that he wants to get to when this happens....hmmmm.