Orange ball on grass: what a dog's colour vision changes about toy choice
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Toy aisles are dominated by fluorescent orange and hot pink. Those shades are chosen so that the owner can find the ball in the grass. From the dog's point of view they are the worst options. Our selection criteria are gathered in the dog toys and enrichment section.
Contents · 5 sections
Two cone types instead of three
Neitz, Geist and Jacobs established in 1989, in Visual Neuroscience, that the dog retina contains only two classes of cone, against three in humans (see the study). From behavioural tests run on three dogs, they computed sensitivity peaks around 429 and 555 nm — one "blue-violet" channel and one "yellow-green" channel. Those values are derived from a model, not measured on isolated photopigments.
The practical consequence: beyond roughly 480 nm, green, yellow, orange and red all recruit the same channel. They do not become invisible — the dog still separates them by lightness, saturation, movement, shape and smell — but they stop being told apart by hue.
Given the choice, dogs follow hue
The open question was whether dogs actually use that information, or rely mostly on contrast as is often claimed. Kasparson, Badridze and Maximov settled it in 2013 in Proceedings of the Royal Society B (see the study). Eight dogs were first trained on a discrimination where hue and lightness pointed the same way, then tested on a combination where the two cues were set against each other.
- Seven dogs out of eight followed hue to a statistically significant degree; only one failed to reach the threshold.
- Four of them did so on all ten of their trials.
- The lightness difference between the cards was deliberately set above the dog's discrimination threshold: they could have used brightness, and did not.
What these studies do not show
Eight dogs is very few: no conclusion by breed, age or sex is licensed. The stimuli were laboratory cards in blue and yellow, never red or green — so the study says nothing about those shades. Above all, the task was choosing between two surfaces in front of the animal, not finding a toy in grass: no publication measures retrieval speed as a function of toy colour. Finally, "dogs use colour" does not mean "dogs prefer blue": no aesthetic preference was demonstrated.
What it changes at the toy shelf
- Outdoors, against vegetation, favour a strong blue. It is the one family of shades that falls on the dog's other channel and separates from grass by something other than lightness.
- Bright yellow remains a sound choice for objects thrown onto sand, snow or a dark surface.
- Indoors the question disappears: on light flooring or a plain rug, lightness contrast is plenty — what matters then is material and size, covered in our comparison of rope versus rubber toys.
- A dog that takes a while to find its ball and ends up using its nose does not necessarily have a training problem: with an automatic ball launcher, which throws far and often, ball colour weighs more than with a hand throw.
Frequently asked questions
Do dogs see in black and white?
No. They see colours, but spread across two channels instead of three, which groups green, yellow, orange and red into a single perceptual family.
Should orange toys be thrown out?
Certainly not: they remain perfectly usable indoors, for chewing or close-quarters play. The disadvantage only shows up at a distance against grass or leaves.
Does this apply to every dog?
Dichromacy is the rule in the healthy dog. Some retinal conditions change things further, as in our article on cone degeneration in the German shorthaired pointer. All our guides are gathered on the dog hub.
See it in the Planète Pets shop: “Toothbrush” TPR rubber chew toy for dogs (€33.90) · the whole shop
This guide is part of Planète Pets’s Dogs universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.