Mine did the same thing but they said she may have a tumor or cancer. It came down to incident where Little Debbie came up missing. I came home from work and We could hear her yodeling. I looked all over for her. It was snowing outside. My son and I realized we didn't check the window wells as we have a doggie door. She had climbed under the bench that covered the window well. She was stuck and covered in snow. We didn't know how long. I got her out. She walked away like nothing happened. The outcome could have been worse had I not come home. We took a look at her quality of life and if we could keep her safe. My cuddle buddy could no longer be cuddled. We did what was best for her and the pack.
Brat people. Remember, the Memphis pups. Their parents had pups on the first heat, aka 7 months old. I had one of the girls and she went into heat the day before surgery. The other girls in the liter went into heat right after her. I had her dad fixed 2 weeks before. Can you imagine if I had waited to fix dad? When to spay is a tricky question that should include a talk with your vet. Each vet may have their own policy as to the right time to spay.