I know exactly what you mean about muscle tone, my dog is 18.5" and 26lb he has taken everything in the past struggles with some things but at that size they all would but he is as lean and ripped as Linford Christie was in his day, he does what the whippet was bred for, has a good nose, a good strike and a good turn of pace at a heavier weight he had no stamina or recovery, on another site someone wrote of their whippet , that they know it has stamina because it ran 3 times one day on the lure but looked fat to me, I really do wish the show brigade would just get out in the field a bit and se