Caninsulin, manufactured by Intervet and known in some countries as Vetsulin, is a porcine lente insulin, made up of 30% semilente (short-acting) and 70% ultralente (long acting) . At present in the US, Caninsulin is FDA-approved for use only in dogs and, just recently, for cats, under the trade name Vetsulin. However, was often used in the US legally "off label" for cats, prior to formal approval..