In the last week or so, Benny has developed a habit of peeing when he gets really excited.. the first time was on christmas which made sense cuz there were a lot more people than he was used to and i thought he was overwhelmed but hes done it a few times since. today at the pet store he ended up peeing on me

luckily i was wearing my waterproof jacket haha. he is pretty well trained but only on pee pads so far so could that have something to do with it? and is there any kind of training or something we can do to prevent this from happening in the future or is it just something to wait until he grows out of?
thanks for any help