How to get a dog to go outside alone?

Dogs do not "grow out of" learned behaviors, in fact they get stronger as the dog ages. We can however, always teach dogs new behaviors to replace ones that we don't like. If you really want to change this behavior, simply require him to be outdoors for a few minutes alone, before you go to the door to let him in, or go out to play with him. Dogs are a highly social species and would prefer the company of a social companion over being out in the yard alone anytime. The fact that he comes in willingly, and seeks you out to "check in" when you're out with him, are both great "problems" to have. I don't think he feels unsafe outside by himself, I think he simply prefers your company, and has just learned to come to the door immediately after he's done doing his business because it rewarding for him to do so. All dogs learn through behavior and consequence, and the association of events that happen closely together. In your case, your dog has learned that as soon as he goes potty, he should come directly to the door to be let back into the house.

Before leaving your dog home alone, you need to teach them that it is alright and that they will be able to cope on their own. The more you do this before you actually need to leave the house, the easier it will be when you do. Take your dog for a long walk before you go out, this will give them a chance to burn off some energy, tire themselves out and go to the toilet. Make sure they have access to water and their food or a long-lasting treat. You could also leave an old item of clothing that smells like you in their bed – and don’t forget that doggy den, which will help make them feel safe and relaxed. Start to build up the time you leave the house for, and factor some time apart into your daily routine. It’s essential to build up time apart very gradually and associate it with something positive, like a long-lasting treat. Monitor how your pup responds, and shorten the time left if they show any signs of anxiety.