Good ol' Shepherdy/Spitzy type mutts. I don't think he would every go out and purchase a dog, he'd just go and adopt whatever muttly adult dog called to him.
He has a thing for Wolf hybrids...I could NOT get it through his head that most people claiming they have wolf hybrids really DON'T, and that *true* wolf hybrids aren't suitable as pets. He grew up with two "wolf hybrids" and it really, really irks me when he spouts out "behavioral" reason they were "wolf hybrids" when what he was telling me sounded like a normal dog behavior. But I really don't want to crap all over his memory of his childhood dogs by saying, "Well, I doubt they were really wolf hybrids", so...I just keep my mouth shut.
Anyways, I think he finally understands a bit more after watching a documentary on Discovery that showed an experiment with human socialized/raised wolf pups and how they ended up maturing in that home environment (aka, NOT WELL).
As to what kind of personality does he like? Dogs that are polite/trustworthy with people and animals. Able to be trusted off leash. Able to play physically and be athletic/active. Attentive to its owner, trainable, go anywhere/do anything type dogs, "sophisticated" in their dealings with other creatures. Dogs that prefer and recognize "their" person over anyone else. Plus or minus watch dog/guard dog ability.
He and Abrams get along rather well, he just thinks Abrams is an idiot with no brain. And he's kind of right, so....LOL