Ultra Guard Plus Flea & Tick Spray for Cats - 8 ozHartz UltraGuard Plus Flea & Tick Spray for Cats provides immediate relief to your cat from fleas and ticks plus has the added benefit of ongoing prevention for up to 7 days. Fleas can lay 50 eggs a day, therefore it is imperative to use formulas that break the flea life cycle. 8 oz. spray bottle.