german shorthair.... behavioral

Question
Hi. I have a 2 year old german shorthair. He is not neutered and can
have a lot of testerone and territorial stuff sometimes. He is
completely potty trained and hasnt peed in the house since he was a pup.
I woke up in the middle of the night and he was hiking his leg and
peeing on me! i cannot imagine why he would ever do this!

Answer
He is portraying terrirorial behavior by marking (peeing) on his territory (your house, leg, etc...) The best way to correct this problem is to have him neutered. It is unlikely that you will be able to correct the problem until he is neutered. If he is left intact (not neutered) you may have to consider keeping him outside or enforcing more discipline when he does things like this, but remember that this is natural and the dog is only doing what comes natural to dogs in the wild. Hope this helps and fell free to ask anymore questions you may have.