She is pretty good with me, and after 2 months would come to me on her own and started using the dog door to go out with another dog to go potty. (pethelpful.com)
He is very smart and learned to use the dog door immediately. (gsgsrescue.org)
You could also train him to use a dog door so he can let himself out if he needs to go. (thehousebreakingbible.com)