Rabbits are not a good food source for mountain lions, but there are options. Colorado is currently working with livestock managers after wolves were reintroduced to the area. One option is to reimburse any livestock lost to wolves.

Nothing can really be done about pets except to keep them under supervision. Even if you live in an area with no large predators, you need to watch your pets anyway (heck, my dog got dangerously close to a deer once, which could easily trample her).