I once a had a dog ... he growled at everybody, dug up the neighbors plants, pissed on their flowers, something just wasn't right about him.... he spun around and chased his tail all day... he would growl and nip at his own back leg... just a crazy dog, but you had to laugh at him and not take him serious, everybody knew he was a little bit wacko... it sorta reminds of someone that bashes their own stock.... just my opinion of course.

https://www.youtube.com/watch?v=TyB6txT9PSE