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is 10 now and developed this problem a couple of years ago. It was not just at night, but anytime she was asleep, napping in my lap or asleep on my pillow snuggled next to my head (not a good way to wake up btw). It seemed to come as a complete surprise to her, as she woke up during or immediately after urinating, not before. All of her labs were normal, the only explanation was that it was a hormonal imbalance that occasionally occurs in older female dogs that were spayed at a very early age. As nearly as I could determine from the records I got from the lady I got her from was that she was about 3-4 months old when she was spayed. Since dogs can also have unwanted side effects from hormone replacement she was placed on antihistamines which resolved the problem for the most part, but she still gets the late night trip right before bedtime. Since your dog just started this late in life it may not be from the same thing, but it couldn't hurt, assuming that your dog has been spayed, to consider it as a possible cause if no other explanation is found. Here is a link to Merck Veterinary Manual online edition page that describes the condition (you may have to cut and paste).
http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/130614.htm&word=canine%2cbladder%2ccontrol |