The red rusty stains on your dog are tear stains caused by porphyrins.
Dog tear stains cause.
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.
Porphyrins are created during the normal cycle of biosynthesis of hemoglobin to create energy.
Dogs may also have adverse reactions to plastic food bowls.
When the eyes are continually irritated this can lead to chronic tearing that produces stains.
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.
Causes of tear staining there are a number of reasons that could lead to tear staining in dogs.
Conditions that might irritate the eye include dog eye infections glaucoma and eyelash or eyelid.
They are created in humans too.
Consider bottled or distilled water as well water often has a higher mineral content states klein.
Porphyrins are commonly called waste products from red blood cells containing iron.
The cause can be related to health issues shape of the eye blocked tear ducts puppy teething ear infection allergies either food or environmental and so on.