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Some female dogs, even if they are not pregnant, will experience what is called a pseudo pregnancy where the body tells the brain that it is pregnant.
No matter what, you need to see the vet tomorrow to find out what's going on.
There are a few diseases, like pyometra, that unspayed females can get that are deadly if left untreated.
Let me know if you still have questions.
Congratulations! What a surprise! We had a rescue dog do that to us one time. It was quite a shock. The vet swore that she was spayed and were quite surprised.
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