My dog is 8 (of a breed that lives longer than average, to about 14 or 15 years). I have only had her a month so do not know if this is new behaviour for her but for some time she has long episodes - she is doing it now - of just standing still and kind of staring at the ground, as though in a trance. She will do it for long stretches of time, just not moving. It is almost as though she is sleeping standing up. It is like some form of dementia, yet she still recognises people, answers to her name. Ring any bells for anybody?