protection from predators??

Solutions for protecting poultry and other live stock from predators such as: birds of prey, coyotes, foxes, mountain lions? I have a covered pen for pigs, building a strong coup and enclosure for chickens, but they will also be let out during the day to free range. I want to make sure no predators can get into my set ups BEFORE I get my chickens and pot bellys. I had some pygmy goats a few years ago that coyotes got and I felt awful so I want to try everything to prevent that. Im more concerned about my pig pen than anything else. I have one dog that is great with all livestock and wonderful about staying on the property but shes pretty fine boned and not very strong. She wouldnt be any match for a mountain lion or pack if coyotes. Would getting another gaurdian dog be best? I was considering putting hot wire around the pig oen but Im sure A coyote or mountain lion could clear that. Any suggestions?