I took my five month old GSD on a ten hour car ride yesterday and he didn't pee one single time. Today, he's been walking around and just randomly peeing while he walks! He's very much so potty trained and whines if he needs to go out. I've been home from work all day and he's been going out every hour, but still having these little accidents that he seems totally oblivious to! Is he just being a stubborn little boy or does this sound like some form of UTI or bladder infection?