There was a hunter whose dog had stirred up a rabbit in the bushes.
The rabbit took off running.
"Go get him!" yelled the hunter. "You can catch him! Go! Go!"
The hunting dog ran after the rabbit as fast as he could, determined to catch him, but the rabbit finally got away. The dog was just not fast enough.
When the dog returned, the hunter shouted at him, "How could that little rabbit outrun you?"
"It's one thing to run for a living, like me," said the dog. "It's another thing to run for your life, like that rabbit."
Inspired by: Mille Fabulae et Una, a collection of Latin fables that I've edited, free to read online. I am not translating the Latin here; instead, I am just telling a 100-word version of the fable.
Notes: This is fable 170 in the book, which is Perry 331.