Really!! That’s how you handle deer/rabbit chasing?? Let them run until they get tired/lost/run over/ shot ect???Seriously really ..are your not serious??My dogs all learned through trial and error that chasing deer was s futile endeavor that just led to being more tired and not catching any deer. Rabbits about the same.
These are hunting dogs and they will want to run after things that run away from them. Eventually they figure out that the big furry things that run are not really fun to chase.