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Have you ever thought that dogs see black and white or that they have night vision or they see better than humans.

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ask some questions to the class before we start

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tennis balls are yellow because it sticks out to them and if you throw a red ball on the green grass they cant see it almost at all.

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http://www.dog-health-guide.org/dog-eye.html

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https://www.daniellopezdo.com/a-case-of-eyes-and-posture-osteopathic-considerations/

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dogs can only see 60 degrees when humans can see 140 degrees

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dogs can see good up close good but not good far away.

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https://www.goodvetandpetguide.com/health-and-pet-info/are-dogs-colour-blind

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dogs can see dark blue light blue grayy light yellow and dark yellow

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Dogs can allso see alot better than humans in the dark, they have low-light vision.

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Irish Setter may not fully appreciate his gorgeous hue, but the dogs can see some color. There are two types of photoreceptors in the eye, tasked with perceiving sharpness and color, called rods and cones.
https://www.care.com/c/stories/6348/dog-vision-fun-facts-are-mutts-myopic-and-o/

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https://iheartdogs.com/can-dogs-actually-see-in-color-find-out-here/

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http://morgana249.blogspot.com/2014/07/10-examples-of-how-animals-see-images.html

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https://www.plumbingsupply.com/thermal-expansion.html

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https://plexidors.com/dogs-can-see-color/

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What do dogs see?
Dogs only have two types of cones [like red-green colorblind humans].
A human eye and brain together translate light into color.
http://www.businessinsider.com/how-dogs-see-the-world-compared-to-humans-2015-7
Light receptors within the eye transmit messages to the brain.
https://www.pantone.com/how-do-we-see-color

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Dogs have 2 sensitive cone cells and humans have three. Dogs cant distinguish green, red, or yellow. Dogs have yellow and blue humans have green, red, and blue.

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Dogs have 2 sensitive cone cells and humans have three. Dogs cant distinguish green, red, or yellow. Dogs have yellow and blue humans have green, red, and blue.

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cite google Cooper Claysen