| First, let me welcome you to the forum Weezer. Now, onto your problem. First, take up the paper completely, it is not doing your efforts any good to allow them to still use the paper as well, it is actually confusing him more than anything.
I would practice crate training your dog. Don't just throw him into it but start him out slowly and build him up until he's used to it. Also, although the doggie door is a great creation, until your dog is completely house broken I would personally take him outside and praise him when he relieves himself outdoors instead of in. Unless you catch you dog actually having an accident in the house do not scold him for it, in reality you only have about 1.3 seconds to correct your dog, after the fact they have no idea what they're getting in trouble for, they just know that you're upset about something.
I would also start you dog on a schedule of taking him outside about every hour to go potty until he starts getting the hang of things and not give him full access to the house until he is completely potty broken, instead confine him to areas of the house where you can supervise them. This way whenever you sense him getting ready to have an accident in the house you can take him outside in time. As he starts getting the hang of things you can allow him to have more free roam of the house.
I believe it's never too late to potty train a dog, but since your dog is already a year old it might take a little longer because you have to undo his bad habit and retrain him with what you want. But it is very possible, just remain patient and consistant. Let us know how it goes! |