When I was with my ex I trained my cat to attack on command.. It would attack any and everything even me.
But only the legs he would never ever go higher then the legs, and the one time he fought my dog he actually won the fight was by accident though not on purpose.
A extremely rich family friend has one of these as a pet out in California.
http://3.bp.blogspot.com/_XtMnq4205U8/R5AzVpZ2E9I/AAAAAAAAAGw/xWWa8zb9Ihc/s400/Bobcat1.jpg