Aesop for Children (1919)
72. THE MULE
A Mule had had a long rest and much good feeding. He was feeling very vigorous indeed, and pranced around loftily, holding his head high.
"My father certainly was a full-blooded racer," he said. "I can feel that distinctly."
Next day he was put into harness again and that evening he was very downhearted indeed.
"I was mistaken," he said. "My father was an Ass after all."
Be sure of your pedigree before you boast of it.
Aesop for Children (translator not identified), 1919. Illustrations by Milo Winter (1886-1956). Available online at Project Gutenberg.