"A wiggle a day makes the humans happy," said the wise old goldfish.
The golden retriever puppy leaned over the pond for a better look, "Really? Cos a wag a minute seems to make them happy too."
The goldfish was silently pensive for what seemed like forever.
Just as the pup was considering pouncing her reflection, the goldfish spoke, "We each do something that makes the humans happy. This is good."
They wiggled and wagged in accord.