One of our cats was taken out by a VERY BIG kitty here at the foot hills of the Rockies. That was years ago and our cats now are strictly indoor - except for one sneaky little door darter. He will walk between the legs of one of our dogs and try to sneak out. He is successful about once every few weeks, but comes back pretty quickly.
How do we know it was a mountain lion that chowed down on our cat? His collar, tags and one leg were found under the limb of a tree that hung over a neighbors six foot fence. It was right where a mountain lion was reported along a farmers ditch at that time.
There are signs up all over the neighborhood about keeping your pets in at night due to coyotes. That are wily critters. If you dog is off-leash, one coyote will come up to draw your dog away. Then, as the dog chases or follows the coyote, they are lead to and find themselves surrounded by the pack! Coyote chow!
Ron