Oh I know that sound only too well. The first time I heard that blood curdling noise was while I was driving I nearly crashed the car cos I thought there must be a fight to the death going on in the back Stopped the car but couldn't find any reason for Ellie's awful screaming. This happened a few more times in various places and I later learned that it was undoubtedly cramp. No idea why but it stopped after she'd been with us for about 3 months - perhaps better diet/exercise/bedding It really is the most awful noise they make, but as for being wimps my other greyhound Barley hardly made a sound when he broke his leg in 3 places!
Beautiful new girl by the way