My current pup is a BRT (Black Russian Terrier) not at all what you might think unless you know them. Goggle search them. Perhaps a more vocal aggressive dog for the barn. English Mastiff's are rather laid back. Mackay Sagebrush is right on the money as always. They are fast little suckers and deadly as well. Lots of pictures of small dogs and cats at the mail box, missing reward etc. Folks do not realize that they are in the food chain.