"Come on, Rover. Let's go for a walk," says Rover's owner as he drags Rover to the front door.

"Let's go for a poo, more like," says Rover to himself. "You're not fooling me."

Poor Rover has to stand out on the street, usually late at night, in the rain and snow, thunder and lightning, in the glare of passing car lights, and go to the toilet while his owner stares straight at him.

"Good boy, Rover. Hurry up," says the owner.

"Leave me alone," says Rover to himself. "My bum is cold."

But Rover does his poo because he knows that he won't get back into the house if he doesn't.

And then the Gigglers come along.

The night that Mister Mack sent the boys up to their bedroom, Rover had done a whopper.

"Wow!" said the Gigglers, rubbing their hands and giggling. "Good old Rover. He never lets us down."

There were four Gigglers there that night. The biggest, the middle-sized, the smallest, and the one that was even smaller than the smallest. This was the first time that the even smaller than the smallest Giggler had been out on a poo-finding mission, so she was very excited about it.

"Are we ready?" said the biggest one.

"Ready."

"Rubber gloves?"

"Rubber gloves."

"Plastic bag?"

"Plastic bag."

"Poo claw?"

"Poo claw."

The smallest Giggler lifted the poo off the path with the poo claw. This was a plastic claw like a crab's that opened and closed when she pushed a lever on its handle.

The middle-sized Giggler held the plastic bag open for the poo.

"Drop the poo," said the biggest Giggler.

"Dropping the poo," said the smallest Giggler.

And she let the poo drop into the plastic bag.

"Catching the poo," said the middle-sized Giggler.

And she closed the bag.

"Well done," said the biggest Giggler. "Twenty pence?"

"Twenty pence," said the even smaller than the smallest Giggler.

This was her big moment.

She took the money from the pouch that covered her green tummy. Her tummy was green because Rover had left the poo right beside a green car.

She held it up in the air. "Twenty pence!"

"Good," said the biggest one. "Let's go."

The money was for Rover. The Gigglers always paid for their poo.

"Rover! Rover!"

The smallest Giggler held the letter box open as the biggest one whisper-shouted into the hall of Rover's house.

Rover was upstairs sitting on the toilet. He always did this when his owner had gone to bed. His owner could never understand how the dog hair got onto the toilet seat or how all the paw prints got onto the toilet paper. All dogs do this and they never, ever get caught.

"What now?" said Rover. "Can a dog have no peace?"

He wiped his bum and flushed the toilet. He washed his paws and dried them and went down to the hall. (Rover, by the way, was the great, great, great - keep on saying "great" for twenty minutes – grandson of Bran, the Irish wolfhound.)

Rover saw a Giggler hand sticking through the letter box holding a twenty-pence piece. The door was red; the hand was red.

He took the coin.

"Thanks, Rover," said the even smaller than the smallest Giggler. "That was a classic."

"Ure relcon," said Rover, because it's hard to say, "You're welcome" when you are holding a twenty-pence piece between your teeth.

Rover went into the kitchen. He found the big bone his owner had given him earlier that day. (Rover's owner, by the way, as the great, great – keep on saying "great" for two hours and thirty-seven minutes – grandson of the first caveman.) The bone was on the mat. Rover held the bone between his paws and pushed the twenty-pence piece into the hollow part where the marrow used to be.

Rover's owner loved him. He loved the way he shook himself when he was wet. He loved the way he pulled the letters through the letter box when the postman was delivering them, and he didn't mind a bit when Rover made the letters soggy. He was such a clever dog. He could beg. He could fetch sticks. What his owner didn't know – and what nobody else knew – was that Rover was a millionaire. Rover had buried over a million pounds, all in twenty-pence pieces and all inside hollow bones, in his owner's back garden. All of that money had been given to him by the Gigglers.

"Oh, look at Rover burying the bone. Isn't he clever?"

"Ha, ha, ha," said Rover to himself. "You'll never know how clever."