Hi Penny meadow, it's a bit of an over simplification to say non-peds are simply whippet/greyhound Xs, of course some are, but I know of some non-peds that can trace their racing pedigrees back to the 60's, way back to the likes of "Bilko", "Blue Peter", etc.
Blando, that 1st picture of your dog doesn't do it justice, the subsequent pics are far better, a really smart type, and don't worry about the slightly feathered tail, many ped owners trim their dogs tail hairs !! I owned a few non-peds in the past and they make excellent allrounders, (racing, working, etc.).
Cheers.