;Nicole has shed some light on this common issue. "Don’t be surprised if your pet won’t go through the door immediately — it’s something new and not familiar for him. Practice holding up the flaps and calling him through the door. As your pet goes through the door, verbally praise him and reward with a treat. Once this is easy for your pet, try putting down the flap and calling your pet from the other side. Remember to use lots of praise as he goes through the door. In no time your pet will be coming and going through on his own."