Hartz UltraGuard Dual Action Flea & Tick vs TevraPet Activate II Flea & Tick for Small Dogs

These two products do not fit the same dog, so the choice is mostly about weight. Hartz UltraGuard Dual Action is for medium dogs of 15-30 lbs and comes with 3 monthly tubes. TevraPet Activate II is for small dogs of 4-10 lbs and comes with 4 doses. TevraPet uses imidacloprid, permethrin and pyriproxyfen, which also cover lice and mosquitoes and are waterproof. Hartz uses a different formula and covers fleas, ticks and flea eggs. Both rate well with owners, but TevraPet's rating comes from far fewer reviews.

• Choose the Hartz UltraGuard Dual Action if your dog weighs 15-30 lbs and you want a 3-month supply of a widely reviewed flea and tick topical.
• Choose the TevraPet Activate II if your dog weighs 4-10 lbs and you want a waterproof treatment that also targets lice and mosquitoes.