This shouldn't be downvoted, ivermectin is highly effective against nematodes (including hookworm and heartworm) and has a good safety profile, no matter the cu

This shouldn't be downvoted, ivermectin is highly effective against nematodes (including hookworm and heartworm) and has a good safety profile, no matter the current conversation. People have used it off-label on dogs for years. If you live in the Southern US you really need to treat your dog and outside cat for fleas and heartworm, and it's not unknown that people who can't afford afford the prescription stuff from vet get a canister of cattle dewormer from the feed store. That said, our vet told me that there are now case reports from the Mississippi Delta about cases of heartworm in dogs regularly treated with milbemycin, a close relative to ivermectin.