I feel like a few breeds, in my experience, that just are not right for my personality/lifestyle is... Individual dogs and mixes could definitely change my mind! I never thought I would get a Husky, even though I love them, and now I appear to have a pup who is part Husky.
*ANY of the inactive Bully breeds (Mastiffs, Bulldogs, Dogues, etc)
*ANY breed over 100 lbs
*Sporting & Hunting breeds
*Most flat-faced dogs (Chows, Lhasas, Pugs)... except for Bostons, I love em to piecesss
*Most toy breeds, except for a few that are larger in size & more active
Sooo, basically, I'm mostly a herding-breed snob
I love all of the dogs mentioned here... but I just could not go back to almost any non-herding bred (besides a few certain breeds), after having Gonzo. He has totally spoiled me and I know that the best dog for me is a very loyal, attentive, energetic, intelligent pup and herding breeds are the best of all of these traits.