My young half cross is getting quite trustworthy with his nose now, and im starting to learn what he is marking by his behaviour. He will act differently with different quarry, which, i suppose is very handy. Another thing with mine is his tracking ability, as I hunt with spaniels and crosses, and if one goes off in the other direction giving tounge, I can slip him away to catch up with the hound, where he will take over and persue the rabbit, and sometimes make the catch.