Marking isn’t the same as urinating to empty a bladder. If your dog marks, it’ll be a smaller puddle (or mark on a cabinet or wall) than it would be for an accident. Both male and female dogs mark as a way to stake claim to an area. If your dog is suddenly marking, it may be a sign of anxiety. But, they may have a reason to want to signal that a certain area is “theirs,” such as a new animal or child in the home.