Cats are sensitive to chemicals, but if you are using a prescription product made for cats, you don't really have any worries.

You just need to enlist a professional and tell them what kind of problem you have, and they'll guarantee they will get rid of them. But the bottom line is that if you don't control them on the animals, you'll never get them out of your environment.

Like I said before, an ounce of prevention is worth a pound of cure, but in the case of fleas and ticks, it's more like a ton of cure.

No, I think I already answered that one, but not in my experience.

No, they don't hurt at all. Many of them are oral chewable tablets. For some of them, you only have to give every three months. There are also topicals because kitties usually don't take things orally so well.