I'm more of a cat person, really.
But I love dogs a lot, too. I grew up with a Shetland Sheepdog, and I'd love to have another - either a blue merle or an all-black one (not sure if all-black Shelties exist, but it'd be cool). Shelties are small without being too
small, very pretty, and very smart - couldn't ask for more!
If I had to pick a big dog, I'd want a Tamaskan dog. They're bred to look like wolves, even though there's no recent wolf ancestry in any of them, so they're fully domestic.