my pup keeps biting me like im his play toy. when he bites me i grab him by the scruff of his neck and slam him to the ground and hold him there and yell no! but he just gets up and keeps on biting. what can i do? im afraid he's going to eat me! he's not growling or really biting. its a game to him but it does draw blood. he would rather bite me than his tug toy. im scared of my dog!