i had this problame for a little while, i fixed it when ferreting, we had a rabbit alive and there was this breeding pen or some thing and the walls were made of wire and the rabbit wouldnt be able to get out, so we put it in there and had the dog chase it in there, eventualy he was sick of chasing it for fun and grabed it. then we were walking around to the next burrow arfter he had grabed the rabbit and a squatter jumped out, i sliped cooper straight away and he pinned. then as i was playing fetch i neeled donw and keeped calling him a goos boy untill he brought it back. i knecked it and we