Dogs can see blue and yellow shades distinctly but fail to distinguish among shades of red, green and orange which all appear to them as tones of yellow or grey.
Most of the dogs headed straight for the yellow bowl, significantly more than did for blue or grey, “even when the grey bowl had food in it and the yellow one did not”.
The researchers suspect one reason for the preference could be that most street dogs have fur shades of orange or brown that appear yellowish in the vision of other dogs.
Now, researchers at the Indian Institute of Science Education and Research in Kolkata say dogs appear to have a preference for shades of yellow.
The researchers assessed over 130 street dogs in the Indian city of Kolkata as each of the canines faced yellow, blue or grey food bowls placed on the ground.
