Dogs can see blue and yellow, but they cannot see red, green, or orange. They also have a harder time seeing shades of gray than humans do.
Dogs have two types of cone cells in their eyes: blue and yellow. Humans have three types of cone cells: red, green, and blue. This means that dogs have a narrower range of color perception than humans do.
The reason why dogs can't see red is because they don't have the right type of cone cell. Cone cells are responsible for detecting different wavelengths of light.
The world looks different to dogs than it does to humans. Dogs see a world that is mostly blue and yellow, with some shades of gray.
Dogs can see some shades of other colors, such as pink, purple, and brown. However, they do not see these colors as vividly as humans do.
There are a few ways to test your dog's color vision. One way is to use a color vision test card. These cards have different colored shapes on them, and you can see if your dog can identify the different colors.
Dogs do not see color in the same way that humans do, but they can still see a wide range of colors. If you are interested in learning more about dog vision, there are many resources available online and in libraries.