Today, for the first time, I left Pepper (5.5 mo) in the crate for about 4 hours since I had to go out. I came back to find her having peed in the crate. She's been completely potty trained for about 2 months now...but I do take her out every 2-3 hours or so. I would think she should have been able to hold it for over 5 hours by now. She does hold it all night. Is this normal?