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- Russian scientists found that dogs have a limited colour range in their vision
- Canines use these colours to distinguish between items
Victoria Woollaston
Daily Mail
July 23, 2013
There’s a common misconception that dogs can only see in monochrome and use varying brightness levels to identify the outlines of items.
Yet Russian scientists have now proved not only do dogs have a limited colour range, they use this visual spectrum to distinguish between objects and select certain items from a line-up.
Previously, dog trainers would avoid using coloured objects when training pets to do certain tasks, but these findings could improve how animals are trained and what they are capable of learning.
A team of researchers from the Laboratory of Sensory Processing at the Russian Academy of Sciences tested the sight of eight dogs of varying sizes and breeds.
They wanted to expand on the work from the University of Washington last year.
Scientist Jay Neitz from the American university carried out experiments on dogs to test whether they could see in colour or not.
He discovered that while human eyes have three ‘cones’ that detect colour and can identify red, blue, green and yellow light; dogs only have two.
This means dogs can distinguish blue and yellow, but not red and green.
The Russian scientists therefore printed four pieces of paper in different colours; dark yellow, dark blue, light yellow and light blue.
The dark and light hues were used to test the theory that dogs use brightness levels to distinguish between items.
In the first test, researchers took a dark yellow and light blue sheet of paper, as well as a dark blue and light yellow combination and put them in front of food bowls placed inside locked boxes.
