The massive german shepard stood over the tiny feline city, absolutely massive. The dog was large enough to  wipe out the entire city in one stomp, his toes already crushing the outskirts due to his carelessness. However, the smaller a micro is, the more resistant they are to crushing, so those that were caught in his pawprint would simply be at the mercy of the dog's toes and crevices until they could find a way to escape. The dog knew this, too, and was enjoying the thought of them having to live deep between his toes.

"I hope you little guys like canine paws, because you're about to get real aquainted with mine!" He bared his teeth and licked his lips as he raised that paw, dirt and debris falling from the sole. The dog had only barely raised his foot before the ground trembled and quaked, throwing him off balance and falling right next to the feline city. "Hey, what gives? You all got a new weapon or some-" A massive shadow shut him up as an enormous object suddenly impacted into dog, city and all.

They were thrown high into the air, the dog's face one of panic, his limbs thrashing about as he tried to steady himself. The city was level with his belly button before they all crashed down, parts of the city breaking off and falling into a massive canyon just on the edge of a titanic cliff. The dog was on his knees, still towering over the small felines. Behind him, there was an enormous smooth cave entrance, with many valleys along the rim, that he didn't pay any attention to, despite the foul atmosphere pouring out from its depths.

The german shepard soon began to stand up, planting his feet on the ground with excessive force to physically demonstrate his ire. Though it was confusing as the dog suddenly found the ground to be incredibly yielding and soft. Bending down, he used a set of claws to go over it, trying to figure out just what in the world he was standing on. Suddenly, the land gave a little quake as the dog fell on his face a foot slipping into one of the canyons.

"Gah, what's that little tickle back there in my bum bum?" a young child's voice said to no one in particular. It seemed to come from every direction at once as the surface began to quake even more, the dog quickly pulling his foot free. 

The poor felines in the stinking city finally knew where they were as the massive cave began to close in, their city crumbling apart with the shifting of the tiny wrinkles in the enormous anus. The tinies were sent down into the massive wrinkles of his flesh where nothing but the rank stale air awaited them soft canyons of flesh that began to "chew" and collapse in on them.

Up above them, the dog that had been tormenting their city only earlier, was facing a far "worse" fate as his titanic body lost to the young one's pucker as it flexed and drew him ever deeper into the foul atmosphere. Many of the micro felines were clinging to the dog's fur, some getting wedged in some warm sweaty areas. 

A few would find themselves between his balls and thighs, his damp fur trapping them in that trough of musk, each shift of the dog's massive thighs forcing them to rub over his massive scrotum, the damp fur sandwiching them in between with each movement.

Others would find themselves between his massive toes with the debris of what little he had stepped on prior. Whole office buildings were wedged deep into his thick toejam which consisted mostly of city scape and trapped felines by this point. Each wiggle of those massive toes would scrunch them up and jam them ever deeper.

The unluckiest would find themselves falling into the dog's own rear end, the unfortunate circumstance of being trapped in not only the massive child's bowels, but the dog's as well, the dog's own pucker working overtime not out of the desire to scratch or pleasure himself, but clenching out of fear as his face eventually passed the threshold and the light was lost with each "gulp" of that unfathomable anus.

As for the young one, he was only just starting to scratch as the light for all of the unknown occupants involved suddenl got much brighter. The rim of the underwear was pulled open as the boy's finger suddenly came into view. The dog watched in absolute horror as the massive pad and claw got closer, the destructive rear entrance yawning widely so as not to impede its descent.

It slammed into the dog, who put his arms up to try and resist, but there was no point. He was plunged further and further into that deep rump, the squelching tunnel accepting him with indifference as he was pushed inside. The finger soon left and the dog was left in the darkness as the anus closed up tightly and the tunnel squelched down all around him, pinng him in place.

The mouse sighed in relief and removed his finger from the back of his undies as he let them snap back into place. He had just falling down on his butt and a small tiny bit of dirt must have gone down the back of his pants, he reasoned. He was entirely clueless to the disaster he had wrought on the tiny feline population and their would-be destroyer. He was just happy that he finally scratched that itch in his "bum bum".