Just after midnight I awoke to a juvenile roosting front porch squawling bloody murder and then heard is fly past bedroom window as I got up. Dog had already broke up action and was working back and forth trying to find his foe. It was dark and I was concentrating by flashlite on where chicken went and found it walking about 50 feet out into yard. Scoob ran up on bird since I kept line on it and gave it a thorough sniffing that stressed chick into flying blindly back to front porch. About 10 feet away from start of commotion was a black cat that Scoob overran and largely ignored in search. As I stood near, the cat began to growl apparently at me which was odd. We have four adult cats, two of which are black so did not think much of it. When I put lite on cat it was not one of ours and it sprinted off leaving a pile of feathers from the juvenile that was just attacked. Scoob, like me, was expecting to find Mr. Fox, raccoon, oppossum or even owl causing ruckus but not a cat. With some effort I picked up juvenile, inspected it to see wounds were minor and placed it on top roost level. Then I repeated same for hen and 13 siblings. Cat most likely belongs to neighbor that allegedly has 15 adult cats plus pit bull we had "fun" with a couple months ago. I am going to likely shoot that cat if it comes back. Scoob is going to have to learn to pick hairs and go after cats that are not ours which is well within his abilites. My roost are resistant to pretty much everybody but cats so this will need to be addressed before birds in chicken tractors released to roost at night. Our cats do not like the neighbor flea bags either so wife will likely not be upset with my selective harvesting.