Recently we have purchased a dog door to allow our dog to go in and out of his own accord - however, although he will go out of the door to investigate noises he will not come back inside until someone comes out and “allows” him in; I’m not sure how to train him to know that going in and out of the door on his own is okay. He can use the doggy door no problem, the issue is he will sit outside and wait for permission to go back in. We have only had this door for a few days - I have shown him how to use the door and rewarded him for coming through both ways, however when I put his bowl with food inside (after showing him I was doing so) then walked away whilst he was outside, he showed interest of coming in but seemed afraid to do so without getting permission. Any advice would be appreciated, I am afraid that he will go outside on a cold night while we are asleep and think he is stuck outside (cannot lock this doggy door due to shape of door).

Recently we have purchased a dog door to allow our dog to go in and out of his own accord - however, although he will go out of the door to investigate noises he will not come back inside until someone comes out and “allows” him in; I’m not sure how to train him to know that going in and out of the door on his own is okay. 

He can use the doggy door no problem, the issue is he will sit outside and wait for permission to go back in. We have only had this door for a few days - I have shown him how to use the door and rewarded him for coming through both ways, however when I put his bowl with food inside (after showing him I was doing so) then walked away whilst he was outside, he showed interest of coming in but seemed afraid to do so without getting permission. 

Any advice would be appreciated, I am afraid that he will go outside on a cold night while we are asleep and think he is stuck outside (cannot lock this doggy door due to shape of door).