The worse I had was the smallest.skinniest boney thing I've ever owned for been a loon loved fox and got into some cows and a bull it was there to the death knocked out 3_4 times coming round straight into.em.again the bellowing was like a fog horn dog lost most it teeth holding on at 30mph like a carrier bag getting flung 40 ft in the air out the pack.of em coming around doing it again cost me a few quid and a one way trip.to.vets