[Yogi and mamma]

my little boy yogi was started on natures variety raw and he has been not wanting to eat it he has been on this diet for a month so i switched from the venison to the beef. now he has been having lots of accidents i think he cant hold it or it just has to come out i guess. its hard and just a tad watery but he has been having accidents in his crate and on the bedroom floor. has anyone had this problem? what should i do? should i get him off raw?