i gave him about 5 min each time but both hit same leg on him thats what made me wonder if i should be doing it if they bust out in a accident i step back and watch em for 5 or till start looking uncomforable but the 5 tends to come up first. he took on a full grown bitch few months ago cause i had pig leg in my hand i dont make him do anything i may knowingly put him in a spot to how he reacts or what not he gos hard the little fella digging in the chest and shakes em off their feet but leaves his legs out to get damaged..