What’s wrong with my dog?

My dog is 12 years old and about 14 pounds. She has been crying out in pain usually while we’re both sleeping. It always wakes me up and it starts out with her kind of flopping around and then shortly after she she starts screeching out in pain and her body stiffens at a weird angle. I’m thinking it could be a... show more My dog is 12 years old and about 14 pounds. She has been crying out in pain usually while we’re both sleeping. It always wakes me up and it starts out with her kind of flopping around and then shortly after she she starts screeching out in pain and her body stiffens at a weird angle. I’m thinking it could be a cramp or a seizure. It doesn’t happen often. Maybe once every couple months.
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