Bit like trying to reinvent the wheel with f1 collie greyhounds I personally think your be disappointed with a f1 after running a greyhound the litter waistage would be high as there to slow for most running dog men then you’ve got to think as the dog get older it’ll slow down even more rendering it useless as a catch dog far better option keep them racey bred with just a drop of base blood id be inclined to find someone with a nice working Lurcher with age an experience on its side something on the line of collie greyhound or collie greyhound deerhound greyhound or a bedlington x greyhound or