What Is the Correct Dosage of Penicillin for Dogs?

Dogs receiving amoxicillin orally should get 10 to 20 milligrams per kilogram of body weight, once per day, states Merck Manuals.

Penicillin is distributed by prescription only, states petMD. Some dogs might experience an allergic reaction to penicillin or experience a loss of appetite, vomiting, diarrhea or joint pain. Some bacteria are resistant to penicillin, so another antibiotic may be necessary to clear an infection.