You didn't say how old he is but if he is still a youngster it is not unusual to have an accident now and then. You are right that expanding their space can promote accidents. It may be best not to let him go upstairs unless you are up there with him. Keep the steps fenced off when you are not going to be upstairs.
Try to keep him in the same room you are in until he is more trust worthy and always praise and reward him for getting it right. Giving lots of encouragement when he does it right is much more effective then reprimanding when there is an accident. |