The antibiotics may be for treating a minor infection, or to help prevent infection at the surgery site. Prednisone was probably administered to reduce inflammation and to stimulate her appetite.
Many animals will go off their food after surgery, in part because the endotracheal tube irritates their throat and the drugs used can cause nausea. Absorbable sutures are used to close the internal layers, and they can develop inflammation as the suture material is absorbed. They can also develop sterile abscesses around the internal sutures, which is not an infection, but can make them feel a little dumpy until it resolves.
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