Sirius, the Dog[1]

There once was a dog named Sirius

Who’d chase his tail, until he became quite delirious

He’d run round and round

Until he wound down

And couldn’t tell his front from his rearious

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[1] The dog in this poem is named after the star, Sirius, which appears in the constellation of the Big Dog, or Canis Major. Because Sirius is the brightest star in the Big Dog constellation, it's called the Dog Star. It's a double star, which means it has a tiny companion star that spins around it. Could that be Sirius' tail?