Dosing Information of Diazepam for Dogs and Cats The typical dose administered to dogs is 0.25 to 1 mg per pound (0.5 to 2 mg/kg) and 0.25 to 0.5 mg per pound (0.5 to 1 mg/kg) in cats, intravenous as needed or as often as every six hours or as a constant rate infusion (a slow drip through the intravenous line).