Hi ya'll,

We went to see our vet today and as I was checking out, I asked for refills on the heartworm med I have used for years. He told me they no longer sell HeartGard because dogs are getting heartworms while on treatment with it. He gave me some printed info about it and I found another study while searching for the links to what he printed for me. Here is the info about HeartGard for those who don't follow Trinket's thread -

Heartworm preventive efficacy study results revealed at NAVC

http://veterinarynews.dvm360.com/dvm.../detail/703785

In the following study HeartGard is Ivermectin/Pyrantel (group #1); Advantage Multi is imidacloprid/moxidectin (group #4)

http://veterinarycalendar.dvm360.com.../detail/714137

This is the article from the Arkansas Democrat-Gazette Dr. B gave me but to read the whole article you have to pay. A lawsuit has been filed against Merial, maker of HeartGard, by a former employee of that company. The lawsuit says, ““Merial has been aware of a serious lack of efficacy” since 2002, even as it continued to market HeartGard as “100% effective”. “ A study found that 20% of dogs treated with HeartGard “regularly contracted heartworms”. The article also says, “It’s not just the number of heartworm larvae that concern Delta veterinarians There are a growing number of anecdotal reports suggesting heartworms in South-Central states are resistant to medication, said R. Kelly Schwalbe, a spokesman for the Companion Animal Parasite Council.”

http://www.arkansasonline.com/news/2...says-20110621/