Color vision in the dog.
Level 5 - mechanism / opinion, no new human data
Animal laboratory and behavioral research
PubMed 2487095 · doi:10.1017/s0952523800004430
What was done
Researchers tested the color vision of three domestic dogs using a series of behavioral discrimination experiments. They measured increment-threshold spectral sensitivity functions and performed direct color-matching tests to evaluate cone photopigment classes in the canine retina.
What was found
Results showed the dog retina contains two classes of cone photopigment with computed spectral peaks of approximately 429 nm and 555 nm, indicating dichromatic color vision.
Why it matters
This study provides foundational behavioral evidence establishing that dogs have functional dichromatic color vision rather than monochromatic vision or complete color blindness.
Limits
The sample size is extremely small (three dogs), and the abstract does not report individual variation, breeds, ages, or sexes. The peak sensitivities were computed from behavioral discrimination thresholds rather than measured directly via physical tissue sampling.
Cited by
- supports Dogs possess dichromatic vision, possessing two types of cone photoreceptors, unlike trichromatic humans.