My dog can recognize my cat outside in the dark, at a distance. I know this because she watches other cats and small animals like she wants to chase them - but not her "siblings" -- so I know she recognizes it as family, even in the dark, even at a distance. Apparently she has really good night vision?? I always hear that dogs don't see color very well, dunno if that's true or not. My childhood dog was about blind, so a dog that sees this well even in the dark just amazes me!