the best way is to just grab him with ur whole hand, almost like making a fist, on his neck with ur thumb and index finger at the base of his skull. he's gonna fight and squirm around but he will be ok. just dont squeeze too hard but u still want to be firm and have control. if he is sick u will start to see bubbles and saliva coming out of the sides of his mouth. also if he's fighting back he will start to breathe harder and that can cause the RI to be more noticeable than just holding him and listening