The less breeds the more chance of predicting the litter. None will be slow by any means Deerhounds when bred properly are like tougher greyhounds, better feet coat etc
And abit slower but more stamina.
Everyone moans about whippet grey have brittle feet, too fast, not enough stamina shit coat etc...so surely breeding deer x whippet would make a more useful whippet gry? If u catch my drift....