The article was from a link on that page(American heartworm society). I read the other article that was posted also. Heartworm is common in areas with Mosquitos present, which is when weather gets to be over 64 degrees at night, which is really in June. My question now becomes why dose the dogs all year round if that is the case? I don't know if it's right but it makes sense, it's another poison in their system for what purpose? I feel comfortable with the DE and other worms, do that is covered.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD