Quote Originally Posted by lizbud
I am really surprised at the number of people who don't protect their
dogs from heatworm infestation. The sad fact is they don't begin to show symptoms until the heart muscle is fully involved.This is a sad and
painful way to die. I'd rather not guess that my dogs will not contract
this horrible disease.
Oh the question only asked about flea medication, so I didn't mention anything about heartworm prevention, but I use heartguard plus.

What is the difference between heartguard and heartguard plus?