I had a mink squeese thru 1 1/2 inch where my tin sideing was stripped with 2x4s The 2x4 is only 1 1/2 ince thick, I wouldn't think a mink could sqeeze thru, but I was wrong. He killed all 15 chickens that were 4 months old, and a week later returned and kill 10 more I had just moved in.The heads and throats were crushed, there was blood every where, but he did not eat the meat, only suck the blood.
I trapped him and nail him to a tree so all his buddies could see him and get the message. well 2 years went by and just this last week I have lost several more laying hens. Tonite another, I got 2 coons, but still think minks are coming from my duck pond. I have a barn that has geese posted out front by the door, and keep a radio playing load 24 hrs a day. That barn has never been hit. I also use to take my dogs to use it by these barns, and with all the recent louisiana rains the sent has been washed away and I hadn't been bringing then out that far, but tonite I walked them out to put some dog sent in the chicken yard.
A mink is not going to stay around a dogs turf, at least thats been my findings. I would put my money on a mink. They are territorial and only suck the blood. They don't like any other critters in their area. Good luck.