My sister had a disaster yesterday. They have an Airedale about 8 years old. He is a neutered male and has been around small dogs most of his life. Yesterday he killed their little Shih Tzu x Maltese, Mikey. She looked out the window when she heard the little Rat Terrier screaming which she never does and the Airedale had Mikey down. They rushed him to the Vet with broken ribs, punctured liver and diaphragm. He underwent two hours of surgery and made it through but later died. They are devastated. I have had my little dogs down there lots of times and he has never shown any aggression whatsoever and I was never worried about him. Her daughter came and picked him up until they decided what to do with him as not sure he should be rehomed or not.