Yep, it's a grey fox. They are here in abundance and will eat your chickens if they can get them. My coop is fox, coyote, cat and racoon proof. The only predator we fear are bears! My little terrier Lexie Ann killed a fox that got into our fenced back yard a couple of years ago and couldn't figure out how to get out. Poor fox. Lexie was/is smaller than that fox, but she ran her till she couldn't run anymore and pounced on her.Looks like a grey to me, although I've never seen one personally, as they are rarer then hens teeth 'round these parts.