We had a pair of Airedales once. They are a breed which was bred to kill small animals. They were both really good with children, but were watched around young ones. The dog really loved babies and smaller dogs and puppies. The bitch was a bit of a bully and had to be watched around people who were scared of dogs. Oh and Airedales will nip with their front teeth as a sign of affection, they don't realise how painful it is.

We also had a German Shepherd one time who was really savage with smaller dogs. We couldn't train her to be nice to them and we couldn't run the risk of passing her on to somebody else just in case she behaved that way to a child, so we had to put her down.