...An old dog running around the place where the tree used to be...
It suddenly stumbles on it's ongoing path around the nonexistent trunk, it falls painfully to the ground and it's collar flies upward onto it's neck, the dog opens it's eyes and stares down at its body, wondering why its ussually tight collar waqs suddenly feeling so loose. It yips suddenly as it realizes that it's paws are getting smaller as well and its hair is shortening dramatically, it twists its head around to look at its backside and its loosening collar went flying off of the dogs head and landed a few inches away the younger dog watched as its tail shortened and fell between its legs as it whimpered helplessly.
You rush forward to help the dog as it fell backward into puppyhood, you pull the puppy into your arms and confort it as it continues to cry, but despite your efforts its cries only become higher and higher as it shrinks further and further until its hair vanishes completely and its eyes close tight and it becomes silent, now to young to make a sound it shrinks farther until it becomes a fetus and then... a fertilized cell, and nothing.
You stare down at your empty palms and then over at the collar that had been clothing a dog a minute ago... You wonder why this is happening... Why?!
And it comes to you...