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You don't want to take any chances with a dog's eye. Often though, swelling under the eye is the result of a dental issue such as an abscess that leads to swelling of the tissue under the eye and around the eye.
Other causes of facial swelling include infection, an allergic reaction to a bug bite or sting, bruising, mouth problems, cancer or muscle inflammation or due to acetaminophen toxicity. If it is possible your dog was bit by a snake, you will need to take the dog into the Vet immediately.
If it is due to infection you should find a cut or puncture somewhere. This swelling will often be warm and painful and your dog should have a fever normally with this type of swelling. Your vet will need to take care of the injury and possibly start your dog on antibiotics.
Swelling due to an allergic reaction is frequently caused by an insect bite or sting. Often the whole head will swell and it is generally not painful though your animal may be itchy. If you feel this may have happened you can give your dog Benadryl dose is up to 2mg per pound every 8 hours and see if that helps. If it doesn’t your vet should be consulted.
If the swelling is associated with acetaminophen poisoning (Tylenol) you often see itchy paws and your dogs gums may appear brownish. See your vet immediately.
If it is caused by a bruise then a trauma would have occurred and in light colored animals you may be able to see a discoloration of the skin.
Certain cancers can develop on the head causing swelling in a specific area. Inflammation of a muscle is another possible cause for a dog’s face to swell and typically it is the lower jaw or the top of the head that swells. As you can see, most reasons for areas of the face to swell do require a vet visit. Since her nasal passages also seem to be affected as well, it does sound more like a dental issue to me. Since increased pressure in the eye from swelling can lead to complications and even blindness, I would not put off a vet visit too long if benadryl doesn't help the situation.
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