We recently took in a stray in March. She got her shots and became strictly indoors on 03/15/17. In the past 2 days she has started jumping like she is startled and taking off running. The muscles on her back "twitch" as well as her tail and sometimes her ears. She is eating, drinking, and going to the litter box as normal. When she isn't having these occurrences she is perfectly normal. I'm taking her to the vet this morning but, I'm not sure how they will diagnose this. Anyone have experience with this or know of something else that can cause it? I'm trying to get a video but she takes off running usually before it happens.