The retina contains more rods than cones allowing dogs to pick up more detail in darkness.
This reflective layer behind the retina amplifies light helping dogs see in conditions up to 5 times dimmer than people
Dog pupils dilate significantly to allow more light in when dark. Cats' pupils dilate even wider
Dogs detect moving objects better than still ones in the dark due to retinal ganglion cell adaptation
Dogs see color during the day, but lose color vision in darkness, seeing only black, white and gray
Color Vision Loss
Sighthounds like Greyhounds have superior night vision compared to breeds like Pugs with bulging eyes
Vary By Breed
Don't allow dogs to run off leash at night - it's harder for cars to see and avoid them in darkness.