“down.” as you say the command, lead your dog’s nose toward the ground and his body will follow.
hold the treat in your hand and keep it in front of his nose. as you say, “roll over”, make a circling motion up and over his head with your hand. his first instinct might be to rise up from the down position as he sees the treat go higher in the air. if this happens, get him back into the down position and try again.
as you make the circling motion with your right hand, gently guide his stomach with your left hand. guide his tummy to roll in the direction of the 