I think your anatomy is pretty correct so far. The snout should be a tad longer, since this is a canine and not a feline. Also I don't think the back dips down as far as it does in your sketch; with all of the fur on top, it should appear a bit flatter. Also, for paws, it's not one big toe with smaller toes beside it; it's more like 4 evenly-sized toes that come together to make one paw.
I hope this is helpful to you ^_^
