It doesn't really matter, because every pet, purebred or not, has the potential to be great!
The greyhounds are purebred, but never AKC certified, because they were bred as racers, which the AKC doesn't recognize. I love the sighthound temperment, and will probably always have at least one rescued sighthound.

I'm glad this poll had the option of 'not sure,' because I really don't know what Pup is! You've all seen her Dog of the Day puppy picture now (sept. 25, 2001), wel, as she got older, and her ears started to stand up, she looked like a purebred Schipperke. Now, she looks more like an American Eskimo Dog, but black. Who knows?