Has he ever been paper trained or do you use puppy pads at all in the house?
I also have a pup who just insists on going inside. My compromise with him has been to just teach him to use puppy pads in the house in a litter box.
So, if I were you I would start by lining your house with puppy pads: 3-4 in every room. When he is loose (have you been crate training him at all? IMHO, potty training is almost impossible otherwise.) watch him like a HAWK. When you see him starting to stiff and circle, take him immediately to one of the pads and tell him to "go potty." When he eliminates, praise him and give him a treat.
As he starts to learn where it's "ok" to go in the house, you can start to decrease the pads until there is a designated spot or two where it's ok for him to go. This way, if he needs to eliminate between outside potty breaks, he isn't going all over your floors.
Just a thought ... is he urinating pretty frequently indoors? You might consider having him tested for any bladder issues, like an infection. Even when my Oscar was really little he didn't go more than once every 45 minutes or so.
Good luck ... this part of their training can be so frustrating.
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