I have a 10 week old black lab. When we first got him, he did not mind when we picked him up and was great. Now, recently within the past 2 weeks, he pees every time we pick him up. I know a lot of people will say its because he's excited, but even when he is with us for a while, he still pees when we pick him up. We take him out regularly and take him out right after he eats or drinks. Why is he all of a sudden doing this when he wasn't doing it before and is there anything we can do to prevent it?