Oh that's heart breaking! You have our prayers! It could be as similar situation to the folks who have a large cat in their area of some sort - it is illegal in many areas to own wild cats - (puma, cougar, panther, etc.) But there is a huge trade in kittens. People buy them thinking that if the kit is hand raised it will be tame and then when the cat gets full sized they either let it go or the fencing doesn't hold and the owner doesn't do anything because it is illegal to have them. Bright lights at night should keep anything away unless it is human raised. Keep all cat or dog food stored away. Report the attack to your local animal control in case it is a pit bull dog or some big dog. And get a gun. Sorry but you need to protect yourself, your family and your animals.