Problems using cat door

Problems using cat door

Max just doesn't seem to get it! We recently installed a new pet door which gives him access to the room that hold his litter box. We've guided him in and out MANY times but he doesn't quite seem to get that he has to use his head to push through the door. After each "guided" push through the door, we reward him verbally and also follow that up with a treat. Once we "help" him into the room, he does his business but will not come out. He'll "paw" at the door, lie down and reach under the door, but will not come out (nor can we bribe him out). Max is almost 11 months old, he can "sit" on command, knows who mamma and daddy are, knows how to fetch his straws, balls, and teddy bear, but poor Max doesn't know how to make his entrance into a room! Does anyone have any training tips, ideas, or advice that may help Max?