Gemmy (Chex's and Barkley's mom) is a full-on wiggledog. Forget the tail, this is like a back-and-forth full-body shimmy. It's adorable.
Mark (Gemmy's dad) was a tail-waver, and you usually had to talk him into it. I used to joke that it was one of his "tricks" - I'd say in a babytalk voice, "Wag your tail, sweetie, wag your tail, cutiepie, come on Markie, wag that tail..." and the longer this went on for, the bigger the wave would get. I'd usually get a "Megan, you're silly!" grin from him, too. It was really cute.
Annie is also a Mark daughter, and she's not really a tail-wagger. Too dignified.
I *think* Tansy (Checkers's daughter) wags her tail, but she's usually bodyslamming me when she does it, so I haven't noticed yet.
I do think that it has a lot to do with personality (or maybe it's just how I perceive their personalities). The more subdued, one-person bitches aren't big tail-waggers (these are the girls who leave for a week to be bred and then snub you for a week after they come home). The party-girl social butterfly bitches (who leave for a week and come home like nothing happened - or who want to tell you how much more
fun that other house was) are the waggers and shimmiers.