We were eating dinner, and our chihuahua mix started having a seizure. Her legs got all stiff and she started trembling and flopping around on the floor. I held her until it was over, it only lasted about 1 minute, and now she is fine. I don't understand what is causing this, she is only 4 and a half and in seemingly good health. I don't know if it matters, but she was a byb puppy, my mom got her without knowing any better (sigh). The last time we actually witnessed this was about 2 years ago. It worries me, and I am wondering if there is some underlying cause. Is there any thing we should do to help her? Thank you!