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Penicillin is an antibiotic that must be used (legally) under the direction of a licensed veterinarian who has prescribed it for your dog. If a veterinarian were to prescribe injectable penicillin for your dog (which itself would be rare - dogs are more likely to be prescribed oral penicillin since it's easier to administer for most owners), he/she would provide the dosing frequency for you.

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12y ago

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