Myth #7: Flea collars are effective.
The reality: "We know that they don't work—the research on flea collars has shown that the effectiveness is only where the collar touches," explains Dr. Rubin. "You'll find fewer and fewer on the market. I've seen dogs with flea collars in the past and fleas are running all over the rump of the animal. Dr. Rubin recommends veterinary hospital-sold products like Frontline to prevent fleas and ticks. Just be sure to never mix up cat and dog products—products designed for dogs can be deadly if applied to cats.