We have leather in both cars. We have a leather couch too. As bad as my dogs can be at times, they have never scratched or chewed the leather. They do not get on the couch (or at least they aren't supposed to, but Lilly has been "testing" the limits, lately, I think hoping that if she curls up in a tight ball, I won't see her ). Even with that big girl climbing on the couch, she hasn't scratched it. They are so much easier to clean, and if you keep the leather conditioner on them, they hold up beautifully.

Just my two cents.