
This is rather a 'specialist breed' and as such I recommend you source, either from here or via the relevant Breed Club, an experienced breeder and go visit. Most, with a mutually agreeable appointment time, should be prepared to sit with you, show you their adults which you needs to see as puppies grow up fast, and answer all the questions you have. Breeders are busy people, especially if they show and/or have a litter, so be prepared to be there on time!
Good luck - they are not just small Whippets!!