Experienced and professional animal trainer provide their insights in answering this question :
A. It could be due to an infection, trauma or a foreign object in the eye. It should be seen by your vet sooner rather than later. Eye problems shouldn’t be left too long without veterinary treatment as some conditions can cause irreversible damage.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

Dogs have a third eyelid, or nictitating membrane, in the inner corner of the eye, which is also covered by conjunctiva. In healthy dogs, the conjunctiva of the eyelids is not readily visible and has a pale pink color. When conjunctivitis occurs, the conjunctival membranes become red and swollen.
Reasons Why Dogs` Eyes Become Swollen

It can occur secondary to an irritant like soap or smoke or an invading foreign matter like dust, hair, and grass. Viruses like distemper, herpes, hepatitis, and canine influenza also could cause eye infections. Funguses and parasites have also been known to result in swollen eyes.

There are several reasons why your dog`s eye might be swollen, such as trauma, bacteria, viruses, and allergies. While most cases of swelling in the eye can be easily cured, if left untreated, symptoms can worsen and lead to further pain and discomfort.
There are many causes for an elevated third eyelid: Horner`s syndrome (a neurologic disease usually seen in older dogs and cats), a mass or abscess behind the eye, a small globe, active retraction of the globe in painful eye conditions or due to loss of orbital contents as in dehydration, emaciation, or scarring.
If one or both of your dog`s eyes are swollen, call your veterinarian immediately. They may recommend at-home treatments like warm compresses, a saline eye rinse, or oral antihistamines, such as diphenhydramine, until you can get your dog into the hospital.
The iris may change color or shape. Swelling of the eyeball. The pupil may change in appearance. The eye could become cloudy, appear dull or even look blue.
The most typical cause of facial swelling in dogs is an allergic reaction. Bug bites, bee stings, vaccinations, medications, certain foods, toxin exposure, and pollen are just some of the many potential allergens that could be affecting your dog if they are presenting a swollen face.
A swollen eye on your dog might look frightening – however, there are many reasons why your dog might suffer from eye inflammation. It is treatable from injuries to allergies – no matter the actual cause of your dog`s eye inflammation.
Swelling of the conjunctival tissue around the cornea occurs to some degree with all cases of conjunctivitis, but the most dramatic examples are seen with trauma, a deficiency of proteins in the blood (hypoproteinemia), allergic reactions, and insect bites.
One popular method is using a warm, damp cloth to gently clean and soothe the eye area. Another option is using a saline solution to flush out any irritants.
The recommended treatment is surgery to replace the gland to its normal position at the base of the third eyelid where it cannot be seen and can function normally. There are several different surgical techniques that can be performed.
It could be normal for eyes to look a little swollen when you wake up in the morning, but severe eye swelling is not. The most common causes of new eyelid swelling include allergies, pink eye, and styes, but skin infections, thyroid disease, and herpes are other possible causes.
Saline eye drops can be used to safely flush any irritants out of a dog`s eye. These drops won`t hurt and may provide some temporary relief to your dog`s inflamed eye. Saline eye drops can be purchased from a pharmacy, online, or from a pet store and gently squirted directly into your dog`s eye.
Do not give your dog any human eye drops, including natural tears, before contacting your veterinarian for advice. Ingredients suitable for humans may not be suitable for dogs (and vice versa). Redness-relieving drops can also contain ingredients such as naphazoline that can be harmful to dogs when ingested.
Your doctor may first prescribe eye drops with an anti-inflammatory medication, such as a corticosteroid. Eye drops are usually not enough to treat inflammation beyond the front of the eye, so a corticosteroid injection in or around the eye or corticosteroid tablets (taken by mouth) may be necessary.
Massage. Massage the eyelids immediately after applying the warmth. Massaging helps to push out the oily fluid from the tiny meibomian glands.
With clean hands, massage along the length of the eyelids towards the ear (massage upper lid down and the lower lid up) with the eyes closed using comfortable pressure. Massage for 30 seconds and repeat 5–10 times after warming the eyelids. This helps to push the oil out of the glands.
Treating Facial Swelling In Dogs

That`s why it`s important to contact a vet rather than to try to diagnose and treat the problem yourself. If the swelling you describe to the vet is mild, they may recommend an over-the-counter (OTC) antihistamine that you can administer to reduce the swelling.

It`s important never to give paracetamol to your dog unless your vet tells you to – it can be very dangerous if it`s given incorrectly.” Claire explains that you should always head to your vet for advice, including if your pup accidentally digests a painkiller.
Eye infections rarely get better on their own. Your pet needs to see a veterinarian right away. Not only can your pet go blind, but eye infections are very painful. Prompt treatment can greatly reduce the pain and improve your pet`s chances of retaining full vision.
In addition, an eye infection can easily be spread to other pets in the home. Untreated eye problems can lead to significant vision loss or blindness if left untreated or if treatment is delayed. This is true even for easily-treated eye conditions such as pink eye.
Some injuries may affect your dog`s ability to open its eye entirely. A bloodshot appearance in the white of the eye may indicate trauma or irritation. A yellow or greenish discharge can signal an infection, which may occur as a result of an injury.
Apply a dressing soaked in sterile saline solution, Prevent the animal from rubbing or scratching the eye (an Elizabethan collar is ideal for this) and call the vet. The dressing will need to remain wet whilst in transit to the vet, so continually re-moisten the dressing with saline solution.
The fact is that if your dog is experiencing any eye sensitivity, irritation, or pain it`s time to head to your vet. Your veterinarian will be able to conduct a thorough eye exam to determine the cause of your pup`s symptoms and provide effective treatment to help your dog`s eyes feel better.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. I have a 10 year old Dalmatian. I just notice the right inner eye lid is swollen. Do you know what might be causing this?
ANSWER : A. It could be due to an infection, trauma or a foreign object in the eye. It should be seen by your vet sooner rather than later. Eye problems shouldn’t be left too long without veterinary treatment as some conditions can cause irreversible damage.

Read Full Q/A … : VTNE Flashcards

Q. Weak, discharge from eyes, swelling on right eye, does not want to open eyes. What is wrong?
ANSWER : A. If the discharge from the eye is green or yellow in color, it can indicate a secondary infection. Swollen eyes can be caused by a number of things ranging from allergies to infections, to injury to the eye itself or surrounding areas.

It is best to have your pet’s eye examined by your local vet. They will most likely wish to place a stain in the eye that can check for damage such as cuts or scratches. An ointment can then be given to help reduce inflammation, pain and take care of infection.

Until you can get to the vet, be sure to not let your pet scratch or paw at their eye as this can make things worse. You can also use a warm wet washcloth to gently remove any debris and allow the eye to open some, providing relief. However, if symptoms worsen, or the swelling travels to the face, head or neck, it may indicate a serious allergic reaction which should be treated immediately.

Q. My pet is suffering eyes discharge, what should I do?
ANSWER : A. Mucus, yellow-green pus, or a watery eye discharge can all be signs of conjunctivitis, which is inflammation of the lining of your dog’s eye.

There is a wide range of causes for conjunctivitis, from allergies, injury, birth defects, and tear duct problems, to foreign bodies, dry eye syndrome, infections or even tumors.

Other signs of conjunctivitis include excessive blinking or keeping the eye closed, squinting and pawing at the eyes.

Treatment of this condition depends on the underlying cause. In most of the cases cleaning, soothing the eye and applying antibiotics eye drops suffice but is some instances further investigation is required to establish the cause of the excessive eye discharge, and this should be performed by a veterinarian.

Q. I was told by my vet that my dogs cherry eye was caused by something hitting his eye when he was poking around under a bush. I was told surgery needed
ANSWER : A. Prolapsed gland of the eyelid refers to a pink mass protruding from the animal’s eyelid; it is also called a “cherry eye.” Normally, the gland is anchored by an attachment made up of fibrous material. The most common sign of “cherry eye” is an oval mass protruding from the dogs’s third eyelid. It can occur in one or both eyes, and may be accompanied by swelling and irritation. He may have acquired it by getting an injury to his eye but this isn’t the case sometimes. Sometimes there is a weakness in the fibrous attachment.

The veterinarian will review the mass in the dog’s third eyelid and determine if there is an underlying cause for the condition. The diagnosis of the prolapsed gland could be scrolled or everted cartilage in the third eyelid, abnormal cells in the third eye, or a prolapse of fat in the dog’s eye.

Treatment often includes surgical replacement of the gland in the dog’s eye, or removal of the entire gland if the condition is severe. Conversely, if medications are recommended, they are typically topical anti-inflammatory drugs that are effective in reducing swelling.

Q. One eye is more red than the other. Last night he was pawing at it,today, he isn’t. Should I bring him to the vet?
ANSWER : A. Sounds possible that he had some irritation to the eye that is at least not itchy anymore. You can do either, having it checked now to confirm mild irritation, potentially due to debris or a topical irritant to the eye; or you can flush the eye with sterile saline eye wash (over the counter) using care not to poke or prod the eye and see if the irritation goes away on its own within the next 24 hrs. It has shown improvement already it appears, however if it is not cleared up and your pet seems irritated by it AT ALL, then it should be looked at by a vet and tested for a possible corneal scratch or ulcer. These can cause redness of the eye, eye discharge and pawing at the face. They are usually treated by prescription only topical eye antibiotic ointment and generally do very well after treatment.

Read Full Q/A … : Eye Problems in Cats

Q. My 10 year old male German Shepard Dog is constantly chewing at his legs, hind quarters and underbelly. No fleas or visible rash. Inside dog. Any ide
ANSWER : A. Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

Q. My cat is excessively scrstching herself., to the point she has sores. She is strictly an indoor cat. Did have flees been treated for 2 months
ANSWER : A. For every flea you see on your pet, there are 100 more in the environment. Get your pet on a good topical or oral flea control through your vet. In flea control, you get what you pay for. Consider asking your vet for a dose of Capstar. It helps get the problem under control by killing the fleas on the pet starting in five minutes but only lasts for 24 hours.

You need to treat your home environment. If you use a pest control service, tell them you are having a flea problem and they can adjust their treatment. Use a premise spray that also contains an IGR, insect growth regulator. This keeps eggs and larvae from maturing into adults and helps break the life cycle. Also, vacuum EVERY DAY, throwing out the bag or emptying the canister every time into an outside receptacle and spraying the contents with insecticide to kill the fleas you’ve vacuumed up.

Treat your yard too, since fleas are opportunistic and will hop a ride into your home on your pant leg without you knowing it. Concentrate on areas under bushes, in the shade. Fleas are less likely to be located in open sunny areas where it gets hot.

If chemicals are a problem, you can use borax. Sprinkle it into rugs, into corners and under furniture, use a broom to work it into the fibers and let it sit for hours, days even. It won’t hurt you or your pet to have it present. Then vacuum it up, reapply as needed. Food grade diatomaceous earth can be gotten from a health food store and worked into the rugs and corners in the same way as borax. These treatments aren’t as fast and effective as chemical insecticides but they can help.

You might want to consider boarding your pet for the day at your vet, to give you the opportunity to flea bomb your house without having to worry about your pet being exposed. They can bathe your pet and give a dose of Capstar while you treat your home.

Be patient, you may have to repeat these steps multiple times 10-14 days apart to help break the flea life cycle.

Skin problems can have a variety of causes, sometimes more than one. It is important to have the problem checked by your vet to determine if there is a medical cause for your pet’s skin issues and treat accordingly.

In pets of all ages, fleas, food allergies and exposure to chemical irritants such as cleaners and soaps can be a cause. Any one of these may not be enough to trigger the breakouts, depending on how sensitive your pet is, but a combination can be enough to start the itch-scratch cycle. Finding out the cause and eliminating it is the best course of action. With flea allergies, if your pet is sensitive enough, a single bite can cause them to break out scratch enough to tear their skin.

Check for fleas with a flea comb. Look for fleas and/or tiny black granules, like coarse black pepper. This is flea feces, consisting of digested, dried blood. You may find tiny white particles, like salt, which are the flea eggs. Applying a good topical monthly flea treatment and aggressively treating your house and yard will help break the flea life cycle.

If you use plastic bowls, this is a possible cause for hair loss, though this tends to be on the chin, where their skin touches the bowl while they eat. If you suspect this to be the culprit, try changing the bowls to glass, metal or ceramic.

Food allergies are often caused by sensitivity to a protein in the food. Hill’s Science Diet offers some non-prescription options for sensitive skin as well as prescription hypoallergenic foods for more severe cases. Royal Canin carries limited protein diets that may also offer some relief. Your vet can recommend a specific diet that will help.

If there is no relief or not enough, consider getting your pet checked by a veterinary dermatologist and having allergy testing done.

Q. We have a 3 yr old Weiner dog, she is having pus in her eyes, I took her to the vet he gave me derma vet ointment, used it as the doctor prescribed
ANSWER : A. If the pus really isn’t all that bad, and it’s just some discharge, your pup may benefit from a diet change. It could be that the food you’re feeding just isn’t right for your dog, and that’s okay! Dogs grow and change over time, and now that your dog is fully matured, a diet change may be in order. Try something like Taste of the Wild, maybe a grain free dog food, Orijen, or Ziwipeak. These are all really great food options.

If the pus is really bad, and continues to get worse, see your vet again and let them know what’s going on. Maybe you could try a diet change, and then see if there are any improvements.

Remember, you should always gradually change a dogs diet. By gradually, I mean you put a tiny bit of new kibble in with a bowl of the old kibble. Reduce the old kibble by just a few bits of kibble. Throughout the course of at least two weeks (or as long as you want depending on whether or not you want to finish off the old food) you slowly add more of the new kibble while removing some of the old kibble. This makes the process gradual, and won’t cause any tummy-upset in your dog.