Just build a decent coop from the start to keep chicken safe at night, and let the foxes roam freely the planet eating as much mice, voles and rats as they can catch. They love that job.
Ms yellowkitty will develop quick the sense to keep away from its path, or show their nails, or climb a tree.
Foxhounds?
But then how do you get rid of all the foxhounds?
Solid Snakes, maybe? Or Lions?
In the event the lions take over a school of Tuna develops a taste for lion. They use kelp to create Tuna breathing apparatuses and establish a beachhead to launch their lion attack.