how long for a flea collar to work
Here's the lowdown: Flea collars do kill fleas. However they do it slowly. It takes about 4 days for a flea collar to kill a flea. In that amount of time, the flea has laid about 400 eggs. Then mom and dad flea die.Now 2 weeks later 400 newly hatched fleas jump onto Fido or Mittens. The flea collar again kills the newly acquired fleas....in another 4 days.ere's the lowdown: Flea collars do kill fleas. However they do it slowly. It takes about 4 days for a flea collar to kill a flea. In that amount of time, the flea has laid about 400 eggs. Then mom and dad flea die.