When a dog’s eyes and face are edematous, you should first rule out whether it was stung or bitten by a living creature. After ruling out stings and bites, you should recall whether you have taken certain medicines recently and whether you are allergic to medicines. It also happens frequently in dogs. The last step is to think about and eliminate the allergens. Generally, atropine and oral tolmin are needed for desensitization. If you have difficulty breathing or heart failure, you should use appropriate medicines for treatment.