This might sound like a stupid question, but I was asked if dogs only seen black and white. I didn't know the answer, so I am wondering if anyone does know. Thanks.
It seems that dogs have color vision. Try the link below-- by a veterinary opthalmologist and surgeon-- and scroll down to the last segment of the article, titled "Color vision."
Quick answer: dogs' vision is dichromatic (two color) rather than trichromatic (three color), as in primates and some species of birds (e.g. parrots). While our vision is based on the ability to perceive red, blue, and green as primary colors, dogs' vision is based on yellow and purple (IIRR).
This has some interesting results, in that it renders dogs "color blind" to difference that we perceive as complementary colors--which is not the same as seeing in black and white. For instance, to a dog, there's no difference between red and green, so a red ball is basically invisible on a green lawn. To a dog, a purple ball would stand out vividly on grass.
Dog toys are colored for human convenience, obviously!
Wayne and Dave,
Thank you so much for the information. I found the site very interesting and all the other information very enlightening. I am in the Medical field and was surprised by all of this. Thank you for being so helpful.
I don't buy the assertation that a red ball is invisible to a dog in grass. I have several very large grassy fields that I take my female GSD to, and we use a red ball for fetch. I throw the ball with a leather sling (David and Goliath style), and it flys close to 300ft. No matter how fast she runs the ball lands about 100ft in front of her every time, and she runs right up to it. Sometimes something will distract her and she will loose track of the ball, and she will be forced to find it by scent. I can tell the difference, and she finds the ball at rest by sight 95% of the time, and 5% of the time by scent.
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