Ooooh, that's hard.
Size, maybe? Not that I want ALL of them to be smaller, but I wish there was a portable option. Like, 35-50 pounds vs the 85-90 pounds that Abrams is pushing. That would be nice.
Oh, and I maybe wish retrievers didn't have to eat All The Things. And we're more gentle with toys.
Otherwise, they're pretty much prefect. But if we're talking Labs, then yes, I really wish there was a more moderate type. I dislike seeing the show steer bench type and the oversized snipey field dogs.