Recently, we decided to try applying a new flea and tick control product on Zeus and Honey. It's called Certifect. It's more powerful than Frontline because it contains an added ingredient - amitraz. However reviewers warn that it is a dangerous product and causes adverse reactions and even death in dogs.
We decided to give this product the benefit of the doubt because none of the products - Frontline, Advantix, etc - we have tried has ever worked on Zeus and Honey and they seem to be getting more and more ticks everyday despite the consistent use of anti-tick sprays and shampoos consisting permethrins and resmethrins.
The ticks are back. Certifect only lasted for a week. Bummer.