"Okay, you two, there's only one bumper . . . so play nice."

"You're supposed to share!"          "No way!"

"I'll dig a hole and bury it so Sydney can't find it."

"HA!  That's what you think!"
"You'll never get it now!"
"Caught you -- give it back."

"I'll hide it in this bush . . .

. . . Sydney'll never find it here."
And she didn't.  I had to retrieve the bumper several times so the dogs could continue playing . . . 
 . . . because each time Jyah got it, he would hide it in a bush.