How can I get my dog to stop peeing in the middle of the night?

I have a 7 months old Shih Tzu and he sleeps in his crate. But in the middle of the night he'll cry and cry for me to open his crate and let him out to pee. I've done that a couple of times and now he's waking up 2 times every night. This is driving me crazy...what can I do to teach him that he has to... show more I have a 7 months old Shih Tzu and he sleeps in his crate. But in the middle of the night he'll cry and cry for me to open his crate and let him out to pee. I've done that a couple of times and now he's waking up 2 times every night. This is driving me crazy...what can I do to teach him that he has to hold it until we wake up.
By the way, he won't drink water after 7 pm and he'll go out to pee before we go to sleep.
THANKS
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