This collar is built around a polymer matrix that slowly and continuously releases two active ingredients across a cat's skin and coat. It is intended for cats and kittens ten weeks of age and older and is worn continuously to maintain coverage for the labeled eight-month period. The collar is odorless, non-greasy, and made to remain water resistant through normal bathing, rain, or swimming, though frequent bathing can shorten its effective life. Application involves threading the collar through its buckle, adjusting it so two fingers fit comfortably between the collar and the cat's neck, and trimming any excess length. A safety release mechanism is built into the buckle so the collar can loosen if it becomes caught on an object. Each package contains one collar sized for cats, with no additional assembly needed beyond fitting and trimming.