|MadSci Network: Zoology|
Faith, Dogs aren't colorblind, but they do see colors differently than we do. Dogs don't seem to be able to see reds and greens very well, so their world probably seems to be in shades of yellow and blue. For a comparison of how you and a dog see colors, go to this web site: http://www.uwsp.edu/acad/psych/dog/dvision.htm Press the link for "Dr. Ps training site", then "General Topics", then "Vision". The first article on acuity and color vision has the picture you should look at, so you'll see what I'm talking about. Dogs don't see fine details as well as humans, either. We usually see 20/20 or a little better, but dogs see about 20/80. That's four times blurrier! Dogs do see better at night, though, and they also see moving things better than we do. That may explain why your dog can spot the moving ball that you throw in the woods. He can tell exactly where it stopped moving. This would come in handy for a dog in the wild hunting squirrels and other small stuff. He'd be able to tell where the squirrel was going, and if it stopped, he could figure out exactly where. I found some pictures of dog retinas too. The retina is the back part of your eye that does the seeing for your eye. There's one picture of a normal eye, and three pictures of dog eyes with a disease called progressive retinal atrophy. http://www.sheepdog.com/diseases/pra/pra.html I hope this helps to answer your question! Tom
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