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Hi this is Dr. Hill. Doxycycline is a good antibiotic for tick born diseases, but is not fabulous for issues in the mouth. It will have some impact on an oral infection, but is just not a number one choice. Did your vet state the cause of the infection (dental disease, etc)? If the swelling has just popped up and is around the eyes and extending to the side of his face, then it may be an allergic reaction. If he rubbing his face like it is bothering him?
I would definitely give him a dose of benadryl then to see the response. How much does he weigh?
Your welcome. He could easily have two to three tablets of benadryl. If the swelling is getting worse and starts to involve his muzzle then he needs to be seen at a local emergency clinic for injectable diphenhydramine and steroids. If he is responding to the benadryl, then give him a dose every 8 hours for at least 24 hours from resolution of the swelling. There is also a remote possibility of a reaction to the doxycycline. Please continues to post any follow up questions You can continue posting on this site for a few days, even after rating my response. Take care.