Red Eye Glow

The French Bulldog and Red Eye Glow

The red eye glow has a simple Scientific explanation. Many FB breeders will not agree with these findings, because they show that red eye glow does not prove the dog is truly a Lilac, since Chocolate and Blue dogs, can and do, have the red eye glow. Red eye Glow simply put is, a lack of pigment (color) in the back of the dogs eye.

All the information below is excerpts from scientists and doctors. This is not my opinion, but scientific fact.
Science don't lie!
Red Eye Glow Explained
 

There’s a simple scientific explanation for why flash photography often results in eye glow, it’s all about the construction of your dog’s eye.

In dogs and many other animals, the retina has a reflective layer behind it called the tapetum lucidum, which acts like a mirror, reflecting light at the back of the eyes. The reflective layer is what helps dogs see better at night. Light is reflected outward, giving the dog's retina a second chance to absorb the rays.

Light that is not absorbed exits the eye, appearing as the eye glow. This is what takes place when you snap a flash picture of your pet. Individual dogs have different colored tapetum, which is why some dogs’ eyes take on a green glow, others a yellow glow, and others red and so on. Eye Glow occurs in a wide variety of colors including white, blue, green, yellow, pink, and red.

Some dogs lack pigment in their tapetum lucidum. In these individuals their eye glow is red, as it is in humans. These dogs could be any color, although it is seen more in the dilute colors.

The color of this tapetal layer varies to some extent with an animal's coat color. A black Labrador retriever, for example, will usually have a green tapetal reflection. A buff Cocker spaniel will generally show a yellow tapetal reflection. Most young puppies and kittens have a blue tapetal reflection until the structures in the back of the eye fully mature at six to eight months of age. Color dilute dogs such as chocolate, blue, and lilac, may have no tapetal pigment, and may therefore exhibit a red reflex just like human beings. Note that this includes all dilute colors in dogs, not just lilac.

If your dog consistently has red-eye in photos, he might not have pigment in the tapetum. This means the red is coming from blood vessels at the back of the eyeball.

 
Credits:

https://www.canidae.com/blog/2013/03/why-do-my-dogs-eyes-glow-in-dark/

https://www.scientificamerican.com/article/why-do-dogs-get-blue-not/

https://healthypets.mercola.com/sites/healthypets/archive/2015/01/09/dog-eyes.aspx

Dr. Becker

https://www.petplace.com/article/dogs/pet-behavior-training/why-do-dogs-eyes-shine-in-photographs/

https://en.wikipedia.org/wiki/Tapetum_lucidum

 
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