I'm not sure about most, but mine is on Trifexis (spinosad + milbemycin oxime). It protects her against fleas, heartworms, hookworms, roundworms, and whipworms.

I'm not sure about most, but mine is on Trifexis (spinosad + milbemycin oxime). It protects her against fleas, heartworms, hookworms, roundworms, and whipworms. I haven't seen a single flea on her the entire time I've had her, she just tested negative for heartworm at her last vet visit, and she tolerates it well.