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Health issues with the Pug

Bilateral Cateracts:
Cataracts are any opaque spot on the lens of the eye, causing at least some loss of vision. Some cataracts are hereditary and some are not. Surgery may help the dog recover some vision.
Corneal Ulcers (also indolent ulcer, recurrent corneal erosion, or ulcerative keratitis):
Ulcers on the eye are most often caused by an intital scratch or injury. They must receive immmediate attention or there will be some loss of sight. Ulcers require a vet's attention to determine the best way to proceed with treatment. Some lines of pugs can go through life without an eye problem, while others have chronic problems.
Distichiasis:
A double row of eyelashes, normally on lower eye, that works much the same way to irritate the eye that is seen in Entropion. Again, surgery is called for because it causes the dog to be very uncomfortable and can go blind. Not life-threatening.
Dry Eye (keratoconjuctivitis sicca):
Dogs with dry eye normally do not have shiney, glistening eyes, but rather have dull and rough-looking eyes. It is caused by the lack of tear production in the eye - either the nerves have failed to stimulate the tear glands, or the tear glands are no longer working, or the ducts that carry the tears to the eyes are blocked. Treatment may help depending on the cause of the problem.
Elongated Soft Palate:
The soft palate is part of the structure of the nose and mouth. If it gets too long, it can block some of the airway into your Pug's lungs. The only way to determine if your Pug has an elongated palette is to put it under anesthesia and have the vet examine it. Trimming the palate to correct this problem is a major surgery in the Pug.
Encephalitis:
Technically, encephalitis is an inflammation of the brain. It can cause seizures (the most common symption) in your dog. There is currently a study being done on "Pug Dog Encephalitis" (PDE) because of a form of encephalitis that is only seen in Pugs. If you or your vet discover you have a Pug with a suspected case of encephalitis, you should click on this link to the seizures and encephalitis page.
Entropion:
When a Pug has entropion, the eyelids roll in, and the eye lashes or hair rub on the surface of the eye, irritating and causing minor scratches. If left untreated, in time, this can lead to a lessening of eyesight. Surgery can normally correct the problem.
Generalized Progressive Retinal Atrophy:
PRA is a general degeneration of the cells of the retina, so that the dog goes blind in midlife - about five, six or seven years of age. As the problem begins small and gradually gets worse, many owners don't realize their dog is going blind before it does. There is no cure for this genetically inherited disease.
Hip Dysplasia:
Hip dysplasia is not exclusively a disease in large breeds. The structure of the hip joint can be malformed in both large and small dogs. In hip dysplasia the head of the femur joint does not sit firmly into the cup of the hip socket, causing the joint to be loose and painful when the dog walks or runs. With small dogs, the onset of problems may not occur until the dog is older, and may never require surgical correction. X-rays can show you the structure of your Pugs hips.
Legg-Calvé-Perthes disease:
The destruction of the femoral head (ball head) in the hip joint due to an improper blood supply. Normally seen between the ages of six months to one year of age. Treatment calls for the surgical removal of the head of the femur.
Pigmentary Keratitis:
When eyes are irritated repeatedly, there is a build up of dark scar tissue on the surface of the eye. It appears as a brown stain that gradually covers the eye over time. This is a symptom of some other problem and should be an indication of some chronic eye problem, either dry eye, entropion, or ulcers. Treatment requires the removal of the original problem, then the use of cyclosporine in drop or ointment form to remove the pigment. Sometimes surgery on the eye can help.
Slipped Stifles (patellar dislocation):
A dislocating kneecap can be either inherited or caused by an accident. The kneecap is a small bone on the front of the stifle to cover the joint that slides along a groove in the femur bone. When this bone slips (due to possibly weak ligaments, poor alignment of the muscles, or a lack of a groove in the femur) then the dog will most often hop when it is running, or limp. Surgery is required if the problem is severe.

Stenotic Nares:
The nostrils of Pugs have been known to be too small and/or the cartilage of the nostrils to be too soft for the dog to breath through, and on inhaling the nostrils can collapse. This causes them to breath through their mouths, and work much harder on getting enough air. Sometimes there is a foamy nasal discharge from the nostrils. Eventually, it can lead to an enlarged heart and heart failure. Treatment requires surgery to remove part of the nasal cartilages and open the nostrils up.
Trichiasis:
Another eye problem, this time with ingrown eyelashes on upper lid, and again irritating the eye over the life of the dog. Correctable with surgery.
(reprinted from Pugs.com)