Today I've found a webpage on Civil War mascots for you. I thought, "Oh sure, dogs; the military always has dogs," and there are a number of them, but how about Robert E. Lee's pet hen? The 26th Wisconsin Volunteer Infantry's badger? (Holy mackerel, a badger. Not a docile animal at best.) Or Cincinnati, Grant's horse?
Have a look, it's short, sweet and interestng.