3/4 whippet 1/4 collie 22`` 23``is what u want. i have a collie whippet first cross very clever, pure whippet 23`` to big for racing . and four 3/4 whippet 1/4 collie lurhers a week old , two will be for sale. i think more whippet than collie is better, so much faster. an 1/8 or a 1/4 collie in a whippet just gives it thicker legs better for crap ground.