my son & i have just got into lamping. we got a bitch 18months old dearhound x greyhound,its working verry well, we dont need to put it on a lead as it will stay by our side, picks up rabbits on the lamp & sometims of too.will jump allmost anything & retreives to hand, it even got a rabbit with big ears the other night when it run out of the lamp. but the lampers we know say the dog is to big for the job. can a bread of dog be to big.if so why