When we moved go Florida 8 years ago I was warned to be prepared for an infestation of fleas since I have two large dogs.

I have never found a single flea on either one of my dogs.  I apply it to my younger dog every month, but to my senior dog I apply it every 2 or 3 months and still have not had a problem.

If you also have a problem with ticks you  will need to use something else to control them.