That was my dog.

They actually took
PH 6 off the market, but are replacing it with Proheart 12, I guess it's supposed to be a once-a-year thing. I'm sure it will also kill lots of dogs, as the poison will be given all in one dose instead of 2. My dog didn't have heartworms. She had a deadly reaction to a dangerous drug that hundreds of other dogs have had reactions to. The vet I see now wouldn't even use it in his office. It was actually one of my main selection criteria for a new vet.
I haven't heard of many problems with Heartgard, but I refuse to buy it anyway because it is made by Ft. Dodge Animal Health, which makes Proheart. Wyeth pharmaceuticals owns Ft. Dodge, which also means no Chapstick, Advil, etc. for me.
I use Interceptor now for both my dogs and haven't had any trouble. I used to use it for my Maggie but the vet just made the Proheart sound so good. I will never make that mistake again. Always research products when your vet pushes them on you- I learned the hard way and will regret it for the rest of my life. Thanks for reading my rant. I have no children so that is what my dogs are to me, and it hurts so much every day that I could have prevented the loss of my baby from corporate greed and lies, had I stayed informed. It's been since May 23, 2003 and it still makes me cry.
I miss my baby so much.