Yes, they do. Anything that they think is theirs, they use them. If you feel your dog is hesitating is may be because he is not used to a dog house in his puppy age. So, something you can do is stow his favourite toy or treat inside to at least make his way. Once he is inside and likes it, we are sure he will get a habit of it. Also, it may happen that your dog does not like the idea of resting in confined spaces. For that, you can either invest in big dog houses or have a removable roof.