its not just when you look at them
i possibly think its a bond
with a dog and a person
or maybe a ring
a ring of trust or somthing

Its just reflecting light, and I heard once that people think dogs are angels on earth, and people are the devil incarnate because of the color their eyes flash during a picture. Its total bullcrap, but interesting.

Dog's have a special membrane in their eye called a tapetum lucidum. Cat's also have this, as do many other mammals.

When light enters the eye, it eventually strikes the retina, which is photosensitive. The light stimulates certain receptors in the retina, these are cones (which detect color) and rods (which detect brightness), and the receptors convert the light into a bioelectrical signal your brain can read. Some of the light though, passes between these receptors. In humans this light just goes through the retina because it's semi=transparent tissue like when you shine a bright flashlight into your hand and can see the light illuminating through your flesh. In dogs and other mammals with a tapetum lucidum, this is prevented though. The tapetum lucidum is reflective and is either located directly behind the retina or within the retina itself, so the light that misses the receptors the first time is reflected back through and has another chance to strike the receptors allowing them to see better in the dark.

Some of this light is again missed and reflects back out the pupil and give the eyes a glowing appearance.