Porphyrins are created during the normal cycle of biosynthesis of hemoglobin to create energy.
Dog tear stains cause.
They are created in humans too.
The most common cause of tear stains in dogs is excess tearing or epiphora which makes the hair and skin around the eyes damp.
The red rusty stains on your dog are tear stains caused by porphyrins.
When the eyes are continually irritated this can lead to chronic tearing that produces stains.
Red yeast which produces a reddish brown discoloration of the face is a common cause of tear stain problems.
Consider bottled or distilled water as well water often has a higher mineral content states klein.
In some cases it is simply because your dog s eyes are irritated by an ingrown eyelash an inverted eyelid or hair growing too close to the eye all painful but easily treatable conditions.
For instance water that is high in iron may be a culprit.
Excess tearing is also your dog s response to irritation.
Klein states that factors in a dog s environment can also cause tear stains.
Conditions that might irritate the eye include dog eye infections glaucoma and eyelash or eyelid.
Causes of tear staining there are a number of reasons that could lead to tear staining in dogs.
Porphyrins are commonly called waste products from red blood cells containing iron.