"The south of France would be lovely," said Mrs. Eliot, "if your father could earn a living there. But unfortunately he hasn't a brother there, and a ready-made practice waiting for him to share, as he has in Johannesburg!"
Jennifer let out a wail. "Susan! What about Susan?"
"Really, Jenny," said her mother. "You must not scream like that. I nearly jumped out of my skin. And it's all right, Susan can come with us. I telephoned South Africa House, and there's no quarantine for dogs going from England--"
From VENTURE TO SOUTH AFRICA, Chapter 1, The Journey Begins. The Susan in question here is not Jane Shaw's best known character Susan Lyle, but the Eliots' Airedale!