I have a similer problem, but this cat isn't owned by anyone. There is a pack of wild cats living in my backyard, and they have actually killed some of my chickens. Last year was when they did the most damage, but this year, I'm prepared- I got an airsoft gun.
With yours, I'd see if he tries to catch any chickens, but he sounds like he's just catching mice.
With yours, I'd see if he tries to catch any chickens, but he sounds like he's just catching mice.