I don't mean to scare you, but could it be a seizure? They aren't all big and violent. The dog I had growing up would act strange when we would take her outside when she was older. She would almost seem like she forgot why she was out there. She ended up having a bad seizure and didn't make it. The vet thought that she probably had a brain tumor because that's usually the cause of seizures if the onset is in older age. I hope she's ok. It's so hard to know what it could be. The biggest thing is to just keep her happy and enjoy being with her for as long as you have her.
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