Thomas Jefferson. (2023, October 10). Wikiquote. Retrieved October 30, 2023 from https://en.wikiquote.org/w/index.php?title=Thomas_Jefferson&oldid=3377889.
Despite popular opinion, dogs can actually see some color. They have 2 photoreceptors, blue and yellow. This means they are unable to see red and green, so finding a red ball on green grass is a very difficult task for a dog.