Some repel ticks and fleas, and some kill ticks and fleas within 18-24 hours of coming into contact with your dog. Here is a ... Prescription Required 2. Frontline Plus: ...

Frontline Plus seems to be less effective than it used to be. K9 Advantix II also kills and repels mosquitoes that might transmit heartworm disease, which makes it a good addition to a dog's ...