Experienced and professional animal trainer provide their insights in answering this question :
A. No don’t worry if no other symptoms. It is likely that something has just irritated it’s nose to cause sneezing just like it does with humans

How to Identify Common Pet Problems ?

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

Things like pollen, mold, dander, dust and dust mites, and dirt can give your pooch a runny nose, watery eyes, and—you guessed it—excessive sneezing. Food allergies can also cause sneezing, so your dog could be reacting to a specific protein source or things like soy, wheat, or dairy in his diet.
The most common causes of uncontrollable sneezing in dogs are nasal foreign bodies, nasal mites, or a nasal tumor. If your pet is incessantly sneezing, especially if it is accompanied by a nasal discharge, seeking emergency veterinary care is warranted.
Occasional sneezing is normal but if your dog is sneezing excessively, violently or uncontrollably, or if they are showing any other symptoms like bleeding from their nose, expelling discharge, pawing at their nose or have a fever, you should contact a vet.
Like us, they sometimes sneeze when their nose is irritated. For dogs, it`s typically caused by dust, pollen or by something that`s got stuck up their nose after rummaging in the undergrowth. But, unlike us, dogs also sneeze as a form of communication to show they`re playing or excited.
Dogs can sneeze due to irritants or foreign bodies inhaled into their noses. They will often sniff around and this is the body`s way to naturally expel them. They may also sneeze due to inhaled allergens such as grass and pollen. Dogs can also have nasal mites that can cause sneezing and sometimes nasal discharge.
As pet owners,if you notice your dog sneezing, it`s normal, it`s important to emphasize that this can be completely normal. However, if your dog starts sneezing more often, or has a sudden, severe episode of sneezing that doesn`t resolve, it could be a sign that they need to see a veterinarian.
Symptoms of canine nasal mite infection in dogs may include nasal discharge, itchiness of the face, sneezing, reverse sneezing, and nose bleeds. The only way to be certain a dog has nasal mites is to perform a nasal scoping or a deep nasal flushing.
Like humans, dogs can develop pollen allergies and they can show symptoms any time of the year. Spring, summer, and fall are usually the time of year when pollen allergies cause most discomfort to allergic pets.
Allergies to pollen and plants are some of the most common triggers for reverse sneezing episodes. Instead of sneezing as a response to these environmental factors, dogs may reverse sneeze. Nasal mites can also sometimes be a contributing factor in reverse sneezing.
Dogs have several reasons for staring at their owners, like to communicate with and understand us. Some dogs stare to manipulate owners, as in with begging for food or asking to be let outside. Training and dog sports are good ways to turn focused staring behavior into a positive experience.
Common symptoms include scratching/itchy skin, licking (especially the paws), and face rubbing. Affected dogs may also experience red skin, loss of fur, and recurrent skin and/or ear infections. You may see red skin or fur loss on your dog`s paws and lower legs, face, ears, armpits, and belly.
Many health conditions can make your beloved animals cough or sneeze constantly. These problems include heart disease, lung problems, distemper, chronic bronchitis, and cancer.
Dogs sneeze like this frequently to get your attention and let you know they want something. These are really fake sneezes. It`s just a way for them to say, “Hey, look at me!” If you watch, you`ll often see them moving in closer as they sneeze at you so there`s no way you can ignore them.
What Should I Do If My Dog Reverse Sneezes? A common remedy is to hold the dog`s nostrils closed for a second and lightly massage its throat to calm him. Lightly blowing in his face may also help. This should cause the dog to swallow a couple of times, which will usually stop the spasm of the reverse sneeze.
Normal Dog Communication

Dogs may sneeze when they are excited, happy, or showing submission to other dogs, for example. If your dog`s sneezing seems to happen most often when they`re excited about a walk or greeting you at the door, then there likely isn`t any cause for concern.

Sneezing can often be a symptom of an illness like the cold or flu. Usually, sneezing will go away once you heal. If you are sick, take good care of yourself! Stay hydrated, get lots of rest, and try some powerful cold remedies.
While the occasional reverse sneeze is usually nothing to worry about, if it increases in frequency or becomes worse, it`s best to have your pet seen by your veterinarian. If not properly addressed, some respiratory illnesses can be contagious to other pets, become chronic or even be life-threatening.
The signs of this illness in dogs are cough, runny nose, fever, lethargy, eye discharge, and reduced appetite, but not all dogs will show signs of illness. The severity of illness associated with canine flu in dogs can range from no signs to severe illness resulting in pneumonia and sometimes death.
Mites look like small spider-like creatures, with are estimated to only be 1/4 to 1/3 millimeters long. To the naked eye, they may look like tiny black dots on the skin, so you can only really see them under a microscope. They have a world-wide distribution, often being transferred from one dog to another.
Skin Irritation, Redness, and Inflammation

Mites can irritate your dog`s skin, leading to redness and inflammation. You may notice areas of skin becoming reddened or inflamed, especially in regions where mites tend to congregate, such as the armpits, groin, paws, around the eyes, and in the ears.

Outgrowing allergies to animals is possible but not probable. Also, even those allergies can go away; they can come back again later in life. Keeping pets will not help to acclimate to allergies either. For some people, allergy symptoms can be worse in some seasons, especially in the heat when animals shed more.
How long do pet allergies last? Once you`re no longer around pet allergens, your symptoms usually go away after a few hours. However, if you have severe pet allergies, your symptoms may last for several days.
For some dogs, especially smaller dogs, over-excitement can also lead to reverse sneezing. For example, your pooch may have a reverse sneezing episode right after you get home from work because they`re excited you`re home.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My morkie sneezes once in awhile, no running nose or watery eyes and still full of energy. Anything I should be concerned about?
ANSWER : A. No don’t worry if no other symptoms. It is likely that something has just irritated it’s nose to cause sneezing just like it does with humans

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. 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 cats nose is stopped up on antibiotics. She has a loss of appetite, acting normal though. Is 3 ounces of can food enough in 24h? 9 pound cat
ANSWER : A. Cats with stopped up noses tend to eat much less, as you’ve noted, because they can’t smell their food as well. And the smell of food is pretty important to a cat’s appetite. You can start by warming up the food in a microwave – not too hot, test it yourself by putting your finger right in the center, as the temperature of microwave food can vary – as this will intensify the smell and hopefully make your cat more interested.

Saline nose drops, like those that are used on little kids, are safe to use on a cat to clean the discharge that is dried around and in the nose. There’s a brand called Little Noses that’s available in the U.S. That I like. You can put it on a q-tip and try to remove the debris. Humidifying the air with a humidifier can help as well, or you can put the cat in the bathroom and run the shower enough to generate steam. Don’t use “real” nose drops like Neo-synephrine or anything else like that – cats quickly build up resistance to them.

A 3 oz can of food is an OK amount in 24 hours, but do try the techniques above to help your cat get more interested in food. You might also try some baby food – no garlic or onions in the ingredients – as cats usually really like the taste of it.

Q. My cat has a runny nose along with runny eyes. Should I worry?
ANSWER : A. Runny noses and eyes are common disorders in cats, and are usually a sign of an underlying condition. The most common one being an Upper Respiratory Infection.

This condition, also known as “cat flu”, is seen most often in kittens. It is caused by one of several viruses or bacteria and common symptoms include a runny nose, runny eyes, sneezing, wheezing and congestion.

In some cases, the discharge may change color to greenish or yellow, indicating a secondary infection. Cats that are in high stress environments or in contact with other cats are most likely to get URIs.

At home, be sure to keep your cat eating and drinking to prevent dehydration. You can also use a warm washcloth to remove any debris from the eyes or nose that is making seeing or breathing difficult.

Finally, keep in mind that if the symptoms continue for more than a day or two, the discharge becomes green or yellow, or your cat appears to be feverish or in distress, veterinary care should be sought without further delay.

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. 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. 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.