sorry it took me a little while to get back to your question.
More than likely your dog is peeing on your carpet. I believe he is too young to start marking. A sure sign your dog is marking is the hiking of the leg(Not that a dog will not hike his leg to pee but a male dog will always hike their leg to mark).
Here is what I think is happening. Your dog likes the carpet. He has a texture preference and it is your carpet. He will go outside and pee(just as much as he has too) and he will finishing peeing when he comes in your house on your carpet.
Not sure what you can try. Would suggest staying longer outside and make sure he is done peeing. I've been told it isn't uncommon for dogs to pee 3 for 4 times before they are really done peeing.
You can try setting down a pee pee pad indoor on the carpet on an area he particularly likes and see if he will start using the pad.
Not sure what else you could try. I'll let you know if I think about anything else. Good luck. |