They might be able to see slightly different colours but it is about the numbre of cones and rods in your eye. Humans have more than dogs so we can see more colours than them. There is this type of krill (i think, idk something like that) that can see over 3 times the amount of colours as us. they see colours we can't imagine. More info on how we see colour here https://www.youtube.com/watch?v=evQsOFQju08
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