Duphamox Dosage and administration Shake well before use. Cattle, sheep and pigs: By intramuscular injection only. Dogs and cats: By subcutaneous or intramuscular injection. Massage the site after injection. The recommended dosage rate is 7 mg per kg bodyweight once daily for up to 5 days (equivalent to 0.25 ml per 5 kg daily). The suggested dosage rates are Cattle 450 kg 20.0 ml Sheep  65 kg  3.0 ml Pigs  150 kg  7.0 ml Dogs  20 kg  1.0 ml Cats  5 kg  0.25 ml Normal aseptic precautions should be observed. Use a dry syringe for extraction of suspension to avoid hydrolysis of amoxicillin. If dose volume exceeds 20 ml in cattle or 10 ml in sheep and pigs, it should be divided and injected into two sites. A separate site should be used for each administration. An appropriately graduated syringe must be used to allow accurate administration of the required dose volume. This is particularly important when injecting small volumes.