The Chronicle
A technical dossier of the canine soul. Chronicle your adventures in the low-stakes world of canine exploration.
Dossier No. 01 · Perception
Dogs are dichromats, meaning they possess two types of colour receptors compared to our three. They perceive the world in shades of blue and yellow. Red and green appear as shades of yellow and grey to them — a fundamentally different experience of colour, which this instrument simulates in real time.
Dossier No. 02 · Anatomy
Common in long-nosed breeds — Greyhounds, Blue Heelers, Collies. A horizontal band of densely packed receptor cells provides excellent peripheral vision and horizon scanning, perfect for tracking prey across open landscapes.
Found in flat-faced breeds — Pugs, Bulldogs. A concentrated spot of receptor cells provides sharper central focus and detail recognition, ideal for face-to-face interaction and close companionship.
Dossier No. 03 · Geometry
Dogs have a wider field of view than humans: 240–270° compared to our 180°. This varies significantly by breed. Long-snouted breeds have the widest fields, while flat-faced breeds trade breadth for more forward-focused, binocular vision.
Dossier No. 04 · Motion
Dogs excel at detecting movement, especially at a distance. They can spot motion up to 900 metres away, though their ability to identify static objects at that distance is considerably poorer. This is why your dog may ignore a still ball but chase one that moves — their visual system is tuned for tracking, not recognition.
Dogs also perceive time differently. Their flicker fusion rate is around 80Hz compared to our 60Hz — meaning they literally see faster than we do. Older televisions at 60Hz looked like a strobe light to dogs. Modern high-refresh screens are finally catching up to canine perception.
Dossier No. 05 · Low Light
Dogs see dramatically better in low light than humans, thanks to three adaptations working together: a rod-dominated retina packed with motion-sensitive cells, larger pupils that let in more light, and the tapetum lucidum — a reflective layer behind the retina that bounces light back through the photoreceptors for a second pass. This is what makes dogs' eyes glow in photographs.
The tapetum reflects green-yellow light, effectively giving each photon two chances to be detected. Combined, these adaptations give dogs roughly five times better vision in dim conditions than humans.
Dossier No. 06 · Hidden Spectrum
Unlike humans, dogs' lenses transmit ultraviolet light. While they may not possess a dedicated UV cone, UV wavelengths still reach their retina — meaning they perceive a dimension of light invisible to us. Research from the Royal Society confirms UV sensitivity is widespread among mammals.
The practical effect? Urine, saliva, and other biological markers fluoresce under UV light. Your dog isn't merely sniffing that lamp post — they can likely see scent markings glowing.
Dossier No. 07 · Resolution
Dogs have approximately 20/75 vision, meaning what a human sees sharply at 75 feet, a dog needs to be at 20 feet to see with the same clarity. Their world is inherently softer than ours. This is no deficiency — their visual system trades fine detail for superior motion detection, wider peripheral coverage, and vastly better night vision. Every adaptation is a trade-off, and dogs evolved to optimise for a very different set of priorities than we did.
Dossier No. 08 · The Extraordinary
Perhaps the most remarkable discovery in canine vision research: dogs may be able to see Earth's magnetic field. Researchers at the Max Planck Institute found cryptochrome 1 — a light-sensitive protein involved in magnetic orientation — in dog photoreceptors. Studies show dogs preferentially align north-south when defecating, and lost dogs appear to perform a "compass run" along the north-south axis before navigating home. Your dog's eyes may contain a built-in compass.