Yesterday and today, my 9 month old female has had a few episodes of displaying intense frightened behavior. This is not normal behavior for her. She suddenly breaks into a frantic run around the house knocking over chairs, yelping and whimpering. Her mouth gets frothy and her bowels let go. She runs around like this until she finds a hiding spot. I've learned to open the hall closet because that is a place she will stop and calm down a bit. After these episodes she is on edge for hours. I'm not sure if this is behavioral or if there is an underlying health problem. I have not been able to associate it with any stimulus. Her normal fear response is barking and backing away slowly, so this is quite different and scary. If anyone has any thoughts or advice, please comment. Thank you.