We had a staffie/ border collie cross and he was brilliant- had a problem with alsations after one attacked him when he was a puppy but no issues with any other dogs or indeed cats – in fact when we introduced a cat into the house he was walking around with a cat claw sticking out of his nose without getting agressive back to the cat at all!
when he farted you just had to say his name and he would walk out the room- very funny!
Great bike dog as well- but would run himself into the ground if you werent careful