So Tex has not marked or pee'd before but I was in our hall bath with the door open and heard a waterfall in the hallway...WTF? Seriously Tex?

So the only two things I can fathom are:
1. We had a stray pitbull adopt us recently for a day and he pee'd on the floor not sure if in the same place

2. Mommy was going potty in the Hall bath and maybe he thought he should go too?

Gosh it was a lot of pee I hope this was a fluke. We cleaned, deoderized and, can hope its over. Any tips? This is the second time this hallway goes to kitchen then back door.