My son 19 years old works full time has a bull x dog 15months old he has this dog out day and night 5,6 times a week, it is very cleaver dog runs cunning,picks up sitters, lamps off lead retrieves live Bunnys to hand ,or jumps out of motor , he uses it ferreting dog marks set ,or digging,he takes big bags of Bunnys and long ears,as well teeth it's what you put into them that makes the dog .