Has anyone had any exprerience with treatment for heartworms? My lab apparently spit one of her monthly pills and now has heartworms. I've talked to two vets. One says kill the heartworms which is a very toxic procedure and dangerous to the dog. The other says weaken the heartworms with ivamec which will reduce the life cycle to 2 years or less. I'm confused because I can find no info on the damage that the weakened worms will do in the 2 years before they die. Any information would be greatly appreciated so that I can make this decision. BTW I am leaning towards killing the heartworms.