Ok, so my puppy is pretty much house trained at home. He has only peed once in my house and that was because I took too long to get my coat on.

The problem is when I take him to my fiance's house he likes to pee on the carpet. I am pretty sure it is because she has a golden retriever and he is trying to mark territory. Except, he isn't peeing on anything upright.

Any ideas? I would like to keep him out at her house, but if he keeps peeing randomly it may not be an option.