i am so glad i read this post, our 6 month old puppy Gracie just started doing the same thing at night, almost every 2-3 hours she would continue to bark no stop, keeping the whole family up. She never did that before only when we first got her. We have even got up with her and taken her out only to discover a tiny little drop of pee. We decided to move the crate into the basement to let her bark so we dont have to listen to it. My poor cat now has to put up with her barking now. I hope a couple of nights and we can move the crate back upstairs again.
Gracie.