> Dogs vision is about 20/200 in general
I'd be careful with this one. I thought the same when I got a puppy, I'd heard similar repeated (often 20/75 is mentioned as well), and especially that they're not supposed to see well in the dark. After his adolescence my Texas Heeler seems to have excellent vision. He regularly spots small birds, piglets, humans, etc at a distance of 1/4 mile through our window (that's as far as the view goes, but many of the objects he sees rival in size what a human can see at a similar distance). Nighttime does not seem to effect this much. I'm sure his vision is at least 20/40, probably even better than 20/30.
He also seems to have more aggressive pattern recognition through partially obscured sightlines. e.g. seeing a deer or human from just a tiny visual sample viewable through dense trees/brush. However, while this seems to have higher sensitivity than humans (sees the deer when humans dont) it also seems to have somewhat lower specificity (occasionally he thinks something is there when it really isn't).
While this could be due to some Dingo genetics not found in other dogs (unique to Australian Cattle Dogs), it's worth noting that Icelandic Sheepdogs were bred partly to defend unusually small icelandic sheep/goats from unusually large birds of prey that eat them (the white-tailed eagle). Therefore they bark at everything that flies, and some owners have noted that they sometimes bark at birds or airplanes that are quite difficult for humans to see.
My personal hypothesis is that there is wider individual variation in canine sight acuity than is acknowledged by the typical rules of thumb.