Johnson's Flea Collar for cats is a water-resistant collar that will kill fleas and prevent further re-infestation for up to 4 months. Flea kill begins almost immediately, but it may take several days for the active ingredient to spread throughout the entire coat.
This collar will fit most cats. If fitted to a fully grown cat, allow enough space for 2 fingers to be inserted between the collar and the neck. For a growing cat, remember to loosen the collar as the cat gets bigger.