Experienced and professional animal trainer provide their insights in answering this question :
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.

How to Identify Common Pet Problems ?

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

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.

If you notice your dog squinting or holding its eye closed and there is discharge coming from the eye, it could be a sign that there is a foreign body in the eye. A foreign body can be anything from a piece of dust to grass seed.
A cat with conjunctivitis will often appear to have a red, swollen and partially or completely closed eye. The condition is very uncomfortable for the cat and it can progress to problems associated with self-trauma to the area, as well as inflammation inside the eye that is more painful and difficult to treat.
If you notice your dog keeping one eye closed, it is time to make an appointment with your veterinarian. He will quickly assess your dog`s condition and take a close look at his eye. He may use an opthalmoscope so he can see into the back of the eye.
If you notice your dog creating discoloured discharge that is weeping from their eye, it may be caused by an eye infection. Yellow or green discharge is enough reason to visit the vets alone, but you may also notice it is accompanied by redness to the eyes.
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.
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.
If you notice excessive watering, plus mucus and pus discharge in your dog`s eyes, it might point to an affliction of conjunctivitis that has inflamed the inner lining of your dog`s eyes.
Cat flu is most commonly (over 90% of cases) caused by infection with feline calicivirus or feline herpesvirus. Both of these viruses can lead to discharge from the eyes, and conjunctivitis. Other signs of cat flu include sneezing, nasal discharge, lethargy, inappetence, and fever.
In some cases, eye inflammation may resolve on its own, but it can also be a sign of a more serious illness. Eye infections can quickly become an emergency so prompt care is important.
Rinse your dog`s eye and eye area with simple saline solution, which can be purchased from a veterinarian or pharmacy, or made with a teaspoon of salt water in a cup of warm water. Carefully instill into the corner of your dog`s eye and dip a cotton ball in the solution and wipe away discharge from around the eye.
If you have any sterile saline eye solution at home, this is ideal. Alternatively, tepid tap water is fine to use. An eye bath is handy to use if you have one, or a sports drinking bottle will provide a steady stream to flush your pet`s eye with. Be careful not to apply too much pressure.
Viral Conjunctivitis: Caused by a virus that can be spread easily and rapidly. Typically it takes around 3 weeks for the dog to fully recover.
Antibiotics: Topical and oral antibiotics can be used to treat certain conditions that cause swelling in a dog`s eyes. A vet may prescribe antibiotics if the swelling is caused by a foreign object in the eye, a bacterial infection, corneal abrasion, or pink eye.
Eyelid swelling usually goes away on its own within a day or so. If it doesn`t get better in 24 to 48 hours, you should call your primary care physician or see your eye doctor. Your doctor will ask about your symptoms and examine your eye and eyelid.
Clean Eyes and Ears are Essential to Your Dog`s Health

Check for redness or other signs of irritation. Healthy eyes are bright and clear, and the white of the eye is pure white. You can help keep them that way by gently wiping away discharge in the corners with a cotton ball or soft washcloth moistened with warm water.

Another remedy is saline solution, which is a mix of salt and sterile water. This solution can be used as an eye wash to clear away discharge and cleanse the affected area. Lastly, apple cider vinegar, a go-to household ingredient, with antibacterial and antifungal properties can help combat the infection.
Symptoms of Dog Eye Infections

You will usually see multiple signs occur at once, like a red, squinty eye. This is because if the eye is infected with bacteria then the immune system will react with inflammation (discharge, redness, and/or swelling), which can also be painful (causing pawing and squinting).

The infection will usually clear up in 7 to 14 days without treatment and without any long-term consequences. However, in some cases, viral conjunctivitis can take 2 to 3 weeks or more to clear up. A doctor can prescribe antiviral medication to treat more serious forms of conjunctivitis.
With appropriate treatment, bacterial conjunctivitis is usually fully resolved within 5 to 7 days. Viral conjunctivitis can take up to 3 to 4 weeks for full resolution. Allergic conjunctivitis will persist until the underlying allergen is discovered and eliminated.
Eye discharge is usually an indication of an infection, injury, or other problem and can cause serious discomfort for your cat. From seeping discharge to scratching, pain, or irritation, eye discharge is an uncomfortable symptom for your pet.
What You Can Do. If your cat allows it, you can try to wipe the eyes clean of the discharge with a moistened cotton ball using a fresh cotton ball for each eye. Avoid using over the counter eye drops on your cat unless a veterinarian specifically instructs you to do so. Observe your cat for other symptoms of illness.
Black tea contains theaflavins and thearubigins, which are thought to have antimicrobial and anti-inflammatory actions on the body. While not fully proven, these molecules have the potential to aid in mild cases of canine and feline conjunctivitis (a.k.a. pink eye).
How long does it take for conjunctivitis to clear up in cats? Many simple cases of conjunctivitis resolve in seven to 14 days with veterinary-prescribed treatment, but chronic cases require prolonged treatment (weeks to months). Cat pink eye will not clear up on its own.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

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. 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. 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. My cat has entropion of the eyes. Vet did surgery on both eyes, the right eye seems ok but the left eye is still running/mucus. Can I use Neosporin?
ANSWER : A. Do NOT use Neosporin on cats or dogs as this product can be toxic to pets if ingested. If the eye is still leaking or has green or yellow discharge it is best to contact your veterinarian. Green or yellow discharge can indicate that a secondary infection has formed and may require antibiotics or cat-safe ointments to help clear it up. In the meantime, you can use a warm wet washcloth to remove any excess debris from the eye very gently, allowing the eye to open and help with healing.

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 dog got into a fight with a cat. I think the cat scratch her eye. I clean it out with water. I have gentak can I put that in there?
ANSWER : A. It is best NOT to place anything in the eye unless specifically instructed to do so by your vet as it can cause more damage to the eye. As cat scratches and bites can easily become infected and the eye is a very sensitive area, it is best to schedule a veterinary appointment as soon as possible to have the eye examined. Your vet can place a fluorescent stain in the eye to check the extent of the damage and can then give you a pet-safe medication to place in it as needed to help it heal. Until you can get to the vet, it is best to keep the eye clean of debris and discharge with a warm wet washcloth, and to prevent your dog from scratching or clawing at the eye with the use of an Elizabethan (cone) collar.

Q. My cat has wheezy breathing, his third eyelid is almost half closed, lots of the time his eyes look tearfilled, phlegm in back of throut he coughs up
ANSWER : A. Wheezing, hacking, and eye tearing in cats is often the result of a viral upper respiratory infection. Symptoms may include sneezing, eye or nasal discharge, nasal congestion, eye squinting, lethargy, and inappetence. Common causative agents include herpesvirus and calicivirus. An exam with your veterinarian is recommended to make sure that his vital signs are normal, including a normal temperature. If he’ll let you check his temperature at home, you can. I suggest lubricating a thermometer and checking his temperature rectally. A normal body temperature for cats will range between 100.5 to 102.5. If his temperature is 103 or higher you should consider bringing him in to your vet. Additionally, if you see yellow/green discharge from the eyes or nose, increased frequency of sneezing, lethargy, loss of appetite, or open-mouth breathing I suggest bringing him to your vet right away. Viral infections, just like in people, can weaken the immune system allowing bacterial infections to occur, which requires veterinary prescribed antibiotics. If there are any other cats in the house, I recommend temporarily isolating them from your sick cat until his signs resolve. Minimizing environmental stress is also recommended for his recovery. If you have any other concerns or are interested in additional information I’m happy to follow-up with an online consultation.

Q. What can be given to dogs to stop the brown draining around dogs eyes? I was told tetracycline would work.
Thanks
ANSWER : A. Eye leakage is normal in some breeds of dogs, especially those that are more “bug-eyed” types. This eye leakage is just normal tears coming from the eye which can stain lighter colored coats. Unless there is an infection it does not need to be treated with antibiotics. Signs of infection usually include drainage that is thick or goopy and is yellow or greenish in color. Dogs with infections may also want to keep the eye closed, or may paw and scratch at it.

For plain tear-staining. Tear-stain wipes can be used around the eyes to remove the stain and bring the coat back to natural color. If infection is suspected, it is best to have your vet take a look at the eye prior to placing any medications in it.