The most common causes for facial swelling are dental issues and some sort of allergic reactions.
With dental issues, there is usually an abscess of one of the tooth roots that causes a swelling
With an allergic reaction, patients can react to either an insect sting/bite, recent vaccination, something they rubbed against, or even something they ate
What Does It Look Like?
Swelling from dental issues is usually seen on one side of the face just below the eye.
Allergic reactions are often seen on both sides and can range from mild to severe.
What Do You Do?
OTC Benadryl can be give at 1mg/lb every 12 hours (adult benadryl is 25mg)
Mild Reactions - cold compress if swelling is present
Moderate/Severe Reactions - see your veterinarian
If above treatments do not work and swelling is on one side, it would be worthwhile to have a vet perform a dental exam.
Do not give Ibuprofen, Aleve, or Tylenol - these can be toxic to your pet!