I guess that you could say I prefer medium size, if that's what the height of wolves are. xD
But omg yes, small villagers are adorable too. Marshal and Molly are the town's little people, and just watching either of them walking around dancing, planting a flower that ranges around their size just makes me go "awwww". I have this fascination of watching my villager's tails bob up and and down. It seems I don't care for villagers with no tails or short tails. xP
Honestly, I prefer the small-medium ones. The big ones are bit too big for my liking and I usually tend to get rid of them. However, the tiny ones like Flurry are sometimes a pain in the ass to find xD I can't even count on two hands the amount of times I needed her for something and had to spend a good 20 minutes going about town looking for her. And then she just pops out of nowhere like nothing happened and she was there the whole time >.>