Experienced and professional animal trainer provide their insights in answering this question :
A. Sounds like an allergic reaction. It should go down by self. The thing to watch is as on face could affect the airways. If any signs of this need to see a vet straight away for antihistamine treatment. As could be life threatening.

How to Identify Common Pet Problems ?

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

Dental Problems and Facial Swelling in Dogs

Tooth abscesses and other dental infections can go deep beneath the gums and cause a pocket to fill with pus, which in turn causes facial swelling. Broken teeth, oral injuries, and periodontal disease are all potential causes of facial swelling in dogs as well.

Common Causes and Treatments of Dog Facial Swelling

If your pet`s face looks swollen, or lopsided, get your dog to a veterinarian immediately. Like people, dogs can be allergic to chemicals, foods, plants, spider bites, bee stings, medication, or a vaccine (though that`s rare).

Irritants such as plastic or plant material may produce inflammation of the lips. Lip infections may develop. Wounds of the lips should be cleaned and sutured by your veterinarian, if necessary. Direct extension of severe gum disease or inflammation inside the mouth can produce inflammation of the lips (cheilitis).
Swelling and redness in a dog`s lip can stem from a variety of things, some more severe than others. Bug bites, stings, dental issues, allergies, injuries and tumors top the list. Some are very minor and require little further attention, and some are severe and need professional care as soon as possible.
Swelling of the Salivary Gland in Dogs FAQs

Yes. The swelling will resolve after surgery and typically no further treatment is required. Without surgery, swelling will usually reoccur until the affected salivary gland is surgically removed.

Myositis is an inflammation of the muscle. Myositis in dogs can be a serious and painful condition and may be an early indicator that the animal is ill in some other way.
Pain and swelling may be reduced by pain medication and steroids. If the swelling in your dog`s mouth is the result of an underlying condition, your veterinarian will work on treating that condition so that your dog`s signs (including inflammation of his mouth) will be resolved.
Unfortunately, there aren`t any home remedies for facial swelling in dogs. This is because the most likely causes of facial swelling are allergic response, infection, or injury, all of which require veterinary attention. Facial swelling of any kind should be assessed by a veterinarian immediately.
If you look inside the dog`s mouth, there will often be swelling and redness on the gums around the affected tooth. If swelling and infection has extended behind the eye your pet may react with a painful response if you attempt to open his mouth.
Applying an ice pack wrapped in a towel to swollen lips can often reduce the inflammation. Never apply ice directly to skin, as this can cause further damage. You may find some relief from swollen lips caused by sunburn by using aloe lotion. Severe dryness or cracking may improve with a gentle moisturizing lip balm.
Common Problems With Dog Jowls

Bacteria and yeast tend to grow in dark, moist places, which makes droopy dog jowls and skin folds a perfect location. These infections of the jowls—often referred to as lip fold dermatitis or lip fold pyoderma—can cause the jowls to become swollen, red, and painful.

Lip fold dermatitis is a form of superficial pyoderma that occurs in the dog. As the name suggests, it most commonly occurs in the lip folds, but it may occur in any skin fold on the body. The infection occurs secondary to irritation, poor ventilation and moisture from tears, saliva, glandular secretions or urine.
The most common sign of a salivary gland tumor is a painless swelling of the upper neck, ear base, or upper lip. Your pet may have bad breath (halitosis) and may drool. You may notice difficulty eating (reluctance to chew or dropping food) or trouble swallowing.
Masticatory myositis in dogs is an inflammatory condition that affects the muscles of the jaw and those that are responsible for chewing (mastication). The cause of masticatory myositis is unknown, but it is thought to be caused by an autoimmune disease.
Irritants such as plastic or plant material may produce inflammation of the lips. Lip infections may develop. Wounds of the lips should be cleaned and sutured by your veterinarian, if necessary. Direct extension of severe gum disease or inflammation inside the mouth can produce inflammation of the lips (cheilitis).
Common symptoms of a food allergy include: feeling dizzy or lightheaded. itchy skin or a raised rash (hives) swelling of the lips, face and eyes (angioedema)
Nonsteroidal anti-inflammatory drugs (NSAIDs) are commonly used to control pain and inflammation in dogs. NSAIDs help many dogs lead more comfortable lives, but these drugs should be used carefully because they all can cause side effects, some of which can be serious.
Treatment of Facial Swelling in Dogs

Mild swelling may resolve on its own, but you still need a vet to check your pet out and determine why their face swelled up. If the cause is due to dental disease, treatments can range from cleaning to tooth removal.

In general, tongue, lip and mouth wounds in dogs tend to heal well due to the environment of the oral cavity. The nature of the oral mucosa and the ample blood supply in the mouth aid in a speedy recovery.
One commonly prescribed antibiotic for oral infections is Clindamycin which is generally given twice daily. Do not give human pain medications to animals at any time without the approval of your veterinarian.
Using a warm salt water rinse or an oral gel specifically for dogs. If your dog`s gums are already inflamed, you can use a warm salt water rinse or an oral gel specifically for dogs. A warm salt water rinse can help reduce swelling and inflammation of the gums and remove bacteria from the mouth.
A healthy, hydrated dog`s gums are pink and moist. Tacky, dry, or off-color gums can be a sign of dehydration. If you suspect your dog is dehydrated, press down on their gums. In a happy, hydrated dog, the color should return immediately.
Gums that are inflamed will be red, can be swollen, and may be receding from the tooth line. It`s important to look at the entirety of your pet`s mouth, as the gums in the front may be healthy but the gums further in the mouth can be reddened and irritated. You shouldn`t see any oral sores or bleeding.
Systemic allergic reactions affect major systems in the body. They may develop immediately or within a few hours. They are usually in response to an allergen with which the dog has had prior contact, so the body will recognize the substance and react more violently.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My Cocker Spaniel keeps getting lumps on her body. She has some on the top of her head that feel soft with about six or so clumped together.
ANSWER : A. Lumps and bumps are very common in dogs. They can be caused by any number of things ranging from allergic reactions, to pockets of infection under the skin, to various tumors and cysts. If the bumps are spreading rapidly, or are very bothersome to your dog it is best to have a vet look at it to make sure it is not serious.

Allergic reaction bumps will often appear as small, red, itchy pockets of bumps anywhere on the body. These are usually treated with an allergy medication or over the counter antihistamine. Abscesses are pockets of infection under the skin that usually are one large bump, however in spreading infections may have other bumps appear. These are often painful or hot to the touch, and may ooze debris that is yellow or greenish in color. Abscesses are usually drained and then an antibiotic given to clear up the infection. Some tumors can also appear as small bumps that begin to spread and their type can be determined through biopsy of the site if other more common causes are ruled out.

Until you can have your vet look at the lumps, it is best to stop your dog from licking or chewing at them. Licking and chewing can cause cuts and scrapes to open, allowing bacteria and infection to spread over the affected area. An Elizabethan collar, or a T-shirt over the affected area can help prevent licking and chewing.

Q. My dog is almost 6 months and she has a bump right underneath where the ribs meet in that upside down V shape. What is it?
ANSWER : A. Bumps can be caused by a number of things including minor allergies to food or environment, cuts or skin infections causing swelling under the skin, or just normal puppy “acne” as your dog enters her “teenage” stage of life. If the bump is not bothersome, it may be best to monitor it for any signs of changing size, becoming bothersome, or if redness appears.

If the bump is red or itchy, it may be good to look into her diet for any common allergens such as wheat, corn, or soy, and to see if the bumps appear anywhere else on the body. If the food is not a culprit, then a daily allergy medication may also help. If the bump is red or hot to the touch, painful, growing quickly, or oozing debris it may indicate an abscess, or infection under the skin, which should be treated by your vet via draining and antibiotics. If your dog is bothered by the area, placing a T-shirt or Elizabethan (cone) collar on her to prevent licking and chewing and spreading infection is best until you can get into your vet.

Read Full Q/A … : Vetinfo

Q. My Lab has swollen lips/mouth on both sides, some redness. No pain when I look/touch/handle these areas, eats fine, and no obvious raised bumps…?
ANSWER : A. Sounds like an allergic reaction. It should go down by self. The thing to watch is as on face could affect the airways. If any signs of this need to see a vet straight away for antihistamine treatment. As could be life threatening.

Q. Shiba Inu. He periodically shakes and trembles, usually unrpovoked and seeming for no reason. Usually cuddling helps but not always. Becomes reclusive
ANSWER : A. I do find that Shiba Inu’s are a really sensitive breed. I think the first thing to rule out is pain. That could be pain from a muscle injury or even gastrointestinal pain. Try to pinpoint whether it occurs after a meal or not. He might be painful due to something going on in his GI tract, and the pain is at its worse after he eats.

I’ve also seen a lot of small breeds like Shibas get back pain, and shaking can definitely accompany that as well. If you haven’t see your vet who can perform a good physical exam and look for any signs of muscular pain along the spine or elsewhere. It’s not a bad idea at this point to consider doing some blood work just to screen for any problems that could be affecting organ function, for example.

If he’s healthy otherwise, I think it’s likely that there’s something that’s scaring him at home. These things can be really difficult to identify, and you have to be really aware and note exactly when the shaking occurs, how long it lasts, etc, and look for patterns. Dogs can hear things we can’t, and he may be hearing things you’re missing, and the noise is disturbing to him. Cuddling is a good idea, also working to distract him and desensitize him with toys and treats might help. But like I said above – definitely rule out pain first.

Q. My dog recently stopped eating after he was overfed by mistake, he seems fine, he is still drinking but refuses to eat. Its been nearly 48 hours now.
ANSWER : A. Overeating may have caused some digestive upset, which is causing him to not eat, however overeating may also cause a serious condition called bloat. Bloat symptoms include a large bloated abdomen that may be painful to the touch, labored breathing or panting, attempting to vomit or defecate without success, refusal to eat, and pale or blue tongue and gums. If you see these signs, then immediate veterinary care is needed. If your dog seems otherwise fine except for not eating, you can try to entice him to eat and settle minor upset stomachs with a meal of boiled rice and chicken, however if he has not eaten in over 48 hours it is best to seek veterinary care as a more serious problem could be underlying.

Read Full Q/A … : When to put a dog to sleep

Q. Why does my dog eat grass?
ANSWER : A. As another user mentioned, dogs can eat grass when they want to vomit. Sometimes, when a dog has an upset tummy, they will eat grass. If you notice your dog eating grass frantically, you can assume vomiting will shortly follow. Grass does not digest and pass normally. If your dog eats too much grass, it can cause serious issues with pooping. Your dogs poop can end up all tangled inside of her, and it can need veterinary assistance to remove it. The same goes for celery, so avoid feeding celery to your dog.

The other day my boyfriend accidentally left the laundry room door open where we were keeping the trash that was filled with cooked chicken bones. She ate one of the chicken bones lightning fast. We had to induce vomiting by feeding her some hydrogen peroxide. After we had fed her the peroxide, she immediately began frantically eating grass because her tummy was upset.

If there is something lacking in your dogs diet, it could be that your dog is eating grass to make up for it. I am sure that my dogs diet is extremely well balanced (I do not only feed her an air-dried raw food-type diet (Ziwipeak), but a wide variety of safe, healthy foods), so when she eats grass, I know that it is because she has an upset tummy.

That is why I think it is important making sure your dog has a very well balanced diet. If your dog is on a low quality kibble, your dog may be trying to let you know by eating grass (or eating poop).

Q. My dog likes to walk around trees and bushes. I noticed today a rash on his back in a straight line and his hair is gone in the area. Help?
ANSWER : A. If you live in a brushy or wooded area it is possible that your dog may have come into contact with an irritant such as poison oak or poison ivy. These can spread to people, so care should be taken when handling the area by using gloves and washing hands. You should also prevent your dog from licking or scratching at the area to prevent the spread of irritation. Topical ointments for pets can be used to treat oak/ivy infections.

Other causes such as allergies, cuts and scrapes, or even external parasites can cause redness as well. Ticks and fleas are common in wooded and brushy areas, so making sure your pet is on a preventative for these is important.

If the rash appears to have any cuts, scrapes, open sores, hair loss or spreads, then making an appointment with your vet is best. Your vet can take a sample of the area to look for any more serious infections causing the redness.

Q. My conure has suddenly developed swealing above the abdomin area. It seems to be in the throat. He has lost his feathers due to plucking awhile back
ANSWER : A. If your conure has plucked himself to bare skin in places, you may be seeing his crop. The crop is an area above the abdomen and located on the neck, usually to one side. The crop is where food is stored before it enters the stomach and digestive tract and is the first place where food begins to be broken down in place of teeth of other animals. If you are seeing swelling in this area after your conure eats, that is normal and means he is eating enough food.

If you are seeing the swelling in another location, or it appears to be painful, hot to the touch or oozing debris, then it may indicate a cyst, growth or infection caused by the feather plucking. Having this looked at by an avian vet is best as birds can hide illnesses until they are very very ill.

Feather plucking is another sign of stress and possible illness in birds. Birds such as conures that are not mentally stimulated enough may develop this behavior and may need enrichment or medical care to help overcome the feather plucking. Speaking with your avian vet to check for illnesses, and adding enrichment to your bird’s cage may help.