Moral of "The Dog Chasing a Wolf"?

I am assembling a book for my young niece and nephew. What do you believe is the moral or lesson for a child, or children in this case, in the tale of "The Dog Chasing a Wolf"?

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The Dog Chasing a Wolf

A Dog was chasing a Wolf, and as he ran he thought what a fine fellow he was, and what strong legs he had, and how quickly they covered the ground. "Now, there's this Wolf," he said to himself, "what a poor creature he is: he's no match for me, and he knows it and so he runs away." But the Wolf looked round just then and said, "Don't you imagine I'm running away from you, my friend: it's your master I'm afraid of."

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Thank you so much for your help!