I've got at least one male human and one dog here (and me, of course) who seemed to be confused some days. I look at it this way......I've earned the right to be confused.

My Max before he went had days where he looked so lost when he'd walk into a room. You could see his little brain trying to figure out "why did I come in here?".

As long as Marlin has you, he'll be OK. He trusts you to take care of him during his "senior moments".