Honestly it never really bothered me, but it would make sense for cats and dogs to remain short instead of being the same height. I do like the height variations now and I prefer our characters being taller but I guess I'm just neutral on this one.
I'm not complaining about the villagers increasing in size. But whenever I look at the old human size and the new size, I think of how weird the new one looks. Apparently we were little kids back then, but now we're adults in New Leaf and counting.
When I first played New Leaf on thought.the height was really weird but now I'm used to it so I don't really care how tall the new character is going to be.
To be fair, I like the jointed, taller villager look, as it gives them a flair of maturity. It makes the player's villager look a lot better than it did, before, too. Yeah, some villagers looked smol and adorable, pre-NL, but I've grown so accustomed to the newer models.
I can't even look at the old models. They look so wrong. Sure, I liked them back in the day but after New Leaf there's no way I'd want to see Animal Crossing going back to that short and stubby design.