My cousin’s pit is bigger than Jaws and he is OK on the regular wired one we had. We had to turn up the sensitivity and correction levels because he’s stubborn, but it was OK. There’s no ignoring this one, it shocks for up to 30 seconds as soon as they cross the boundary. The other ones only shock while in the boundary zone and will not shock when they get on the other side, his dog would blast through and stay outside of the boundary on the other one, this one he can’t.