Leo is 6 months old, he gets neutered next Thursday. He marks everywhere but in our house. I can't take him to ANY other house without a belly band. I'm hoping that he stops after he's neutered, but ...
I picked Leo up when he was 12 weeks old, he is potty trained. He started to lift his leg at 4 months old, and is the only dog I have had that is ambidextrous. In fact, sometimes he walks on his two front legs cause he can't make up his mind which one he wants to lift.
My last yorkie-x was a male, he marked but never in anyone's house. My Poodles have both been male and never messed in the house. I say it's a lottery