STRONGHOLD 15 mg: cats and dogs weighing 2.5 kg or less STRONGHOLD 30 mg: dogs weighing 2.6 kg - 5.0 kg STRONGHOLD 45 mg: cats weighing 2.6 kg - 7.5 kg STRONGHOLD 60 mg: dogs weighing 5.1 kg - 10.0 kg STRONGHOLD 120 mg: dogs weighing 10.1 kg - 20.0 kg STRONGHOLD 240 mg: dogs weighing 20.1 kg - 40.0kg