I made the mistake of leaving my friends in our garden with my staffy bitch. He was a working dog and worked with my staff bitch on and off a few seasons.so I thought as they had never had a scrap in the two years working together they would be ok.-Big mistake! We had only been gone an hour and came back to a very dead wheaten.(much to our upset) My staffy had never been dog aggressive in her life so im sure she wasnt the culprit. just beware if you are keeping dogs together,as im sure he had started this scrap and he wasnt particularly dog aggressive either-just be carefull.