I have a 1 year 4 month yorkie he has been trained to wee outside,but lately he keeps weeing and speading the wee while he walks.The door is open at all times so he can go out but he does not ,We put him out after sleep and at night and in the morning also when he had his meal sometimes he may wee but sometimes he does not then comes in and does it.Also when we have visits from family and when it rains outside he won't go out and wee.what can I do?

Has he been checked for a bladder infection (or uti)? If he wees even while he walks, something is definitely wrong.