You don't let your children go round biting others so why let your dog?
Would you let your child run on to the street with a carving knife when there were other children around? Unlikely. Why then would you allow a dog that could turn nasty to wander freely among children?
A few weeks ago I took my children for a walk in a big park. Suddenly out of nowhere a huge dog came bounding over and jumped up on my four-year-old, knocking her to the ground. She was completely hysterical. He put his face up to hers and . . . thankfully licked it. But he could just as easily have bitten her.
I was furious. I looked around for the owner who came strolling over, full of good cheer. When I asked him through gritted teeth why he didn't have his dog on a lead, he said the poor dog needed a good run around!