At weekends, I take the dogs to an arboretum nearby, 100 acres of trees and paths that they can wander round. It's a favourite place for dog-walkers to go, but also for people to take children to, so they can let off steam.
As we arrived, a toddler was being carried back to the car. She saw Holly and did that backwards lean that always alarms parents, and shouted "Zebra!"
Her mother said, "No, dog."
"Greyhound", I said.
"Just because it's black and white doesn't mean it's a zebra", her mother said.
We all gave up. Holly's a zebra.