just wondered if anyone has any experience of both these xs,iv had bull/grey in the past but my current bitch has a touch of whippet in her,has anyone noticed anything different between the two,working ability,behaviour or anything really noticeable that may spring to mind,i know maybe a daft question but my bitch just seems a bit more flighty(if that's the right word lol)bit more up on her toes as it were,not just a running meat head like all the others iv had,i will say she was a bit of a slow starter but now runs like a seasoned dog, no f*****g about and clever as well i know dogs are rarel