Pet dogs' vision is dichromatic; their visual earth is made up of yellows, blues, and grays.[40] They have got difficulty differentiating concerning red and green,[forty one] and very similar to other mammals, the Pet dog's eye is composed of two sorts of cone cells when compared with the human's three. https://happy-dog66654.newbigblog.com/43775509/what-does-happy-dog-mean