I use spot-on for fleas and tapeworms. I don’t think there’s an alternative for worms and I wouldn’t want to take the risk as my cats are hunters, but I’m feeling increasingly uneasy about the impact of insecticides on the environment and thinking that if I could stop using the spot-on for fleas, that would at least reduce the impact a bit. But is there any alternative that actually works? Has anyone found anything with less environmental impact that still works on fleas? Thank you!