cats won't work with all pests. birds, mice, little critters yes, but not something bigger.
we have 3 very tough feral (but fixed) cats that live in our backyard and that of a few neighbors. birds and mice don't stand a chance, but i caught a tomato stealing ground hog 2 seasons ago. i saw it walk right past the cats once. all they did was hiss at it and move out of it's way.
btw, if you catch a groudhog in a humane trap and want to release it, make sure you travel at least 5 miles from your home. they can and will find their way back, often using sewers as highways, if you don't go far enough.
i made the mistake of bringing it to a park about a mile away on the other side of town. i figured it was on the other side of a very busy section of the town center, across a highway, past large stores, city hall, schools, and so on.
as soon as we released it into the woods in the park, the damned this climbed straight up a huge 15 foot chain link fence that surrounded a water tower. the amazing thing was that you could see it was searching, facing the exact direction as the crow flies for the way back to my house.
lo and behold, the little bastid was back stealing tomatoes by the following night.
one of my drunken neighbors caught him in their garden after that, and wasn't as nice.
