Quote Originally Posted by jonesn View Post
1) It is my understanding that canines lack the necessary rods/cones in their eyes to perceive color. If they never experience the sensory input/experience of color then they lack that cognitive model in their mind/brain. I seriously doubt their visual cortex could "invent" color for them in the dreamscape.
Dogs have 3 types of rhodopsin, the pigment in cone-cells. Humans have four. So dogs probably can see colour, although differently than humans. Some type of birds actually have five types of rhodopsin, I wonder how they experience the world.