A Fire Hydrant by any other Name

In the past week or so, my husband has been in the habit of coming into the house, walking back to the kitchen, washing his hands and blowing his nose (not necessarily in that order). Remember that he has just left his own place not five minutes before, so why wait til he comes to my place to wash his hands. I asked a friend what she thought that might be about, and she said it sounds like a dog pissing on the corners of his territory. I asked another friend, and she agreed -- her ex-h does the same thing -- when he picks up the kids, walks all the way through the apartment, goes to the bathroom to pee, looking in all the rooms as he goes.