Engorge, Engorge, Engorge from the Muzzle
Fur grows a bright pink sheen,
Awooooooo, soon enough you're she!

(What remained of Brainy shrunk until she was Mammoth's size while her ears and tail thin out to match her. Brainy was now a clone of Mammoth Mutt! She was so shocked that she headed towards Earth to yelp the bad news of Krypto's owner Kevin because she had a feeling Krypto would be next. She can be right seeing him [or rather her] sporting overstretched pink fur. When she arrived, she discovered Kevin and her mother Mary with some balloons.)

Kevin: Say you're one of Krypto's friends. What are you doing her-oooh! My stomach!
Mary: Kevin, sweetie, this is what happened with certain cola, I warned young ma-Whooa, mine too...

(Instantly, Kevin and Mary's torso grew vividly and humongously, becoming giant spheres that almost touched the ceiling. Their shirts and pants stretched over their spherifying bodies like they were painted on. But looking down on the Mammoth Mutt, they calmly smiled at her as Kevin gained some cartoonish eyeleashes, his nose softened and blackened & Mary's pickering hair busted her ponytail scrunchie as it crawled on her breast-flattened body. Clearly, they both also have...)
Engorge, Engorge, Engorge from the Muzzle
Outstretched clothes as debris,
Awooooooo, soon enough they're she!

Original Mammoth: Holy frijoles, not you too.

(After deflating, what was left of the former human beings scurried out these unnecessary clothes, only to show that they too truly have irreversibly turned into her. She screamed out of the doggie door and as she ran, to her grim, every living thing in Metropolis was morphing into her. The metamorphosis was simple)
Well, there's no escape, first you inhale so great that your torso extends to a huge round shape.
Then lots of pink fur lunge, new paws come with a crunch, as her eyelashes and head mutate until you and her are one...

(In due time, she found Streaky the Supercat, thankfully unaffected by this Mass-Twinning of Mayhem.)

Streaky: Whoa, Mammoth Mutt, am I glad to see you!
Original Mammoth: Likewise! Something's terrible been going on.
Streaky: Tell me about it, while Andrea was brushing, suddenly her body was blimping like crazy and before long, when her nose and mouth spurted forward getting fuzzy & her gentlely cute hands gained balloonish paw pads, I realized she becoming you. She even said she doesn't know who Andrea was.
Original Mammoth: It's worse than that, everyone in town, including Brainy and Krypto became me too. We'll have to head somewhere to think this through, we gotta go.

(Before Streaky could begin to fly, his nose jiggled and his chest was to puff, like he was...)
Starting to Engorge, Engorge, Engorge from the Muzzle
Bloat as tall as any tree,
Awooooooo, Metropolis will be she...

(It's true, Streaky became her as well. The original Mammoth should be blown away and unhappy, then again she figured out how to make this into a positive. She has a whole army of herself to help her crush anything with justice, made up with...)
many pink ballooning chihuahua, Awooooooo...
Bounce, grrr, puppies...

(The Mammoth Mutt copies nodded and tipped in agreement as they inflated their bodies as did the original Mammoth & all of them smiling, they proudly bounced to the same boom rhythm. Look out, trouble! You'll be crushed as each of us...)
Engorge, Engorge, Engorge from the Muzzle
Mammoth Mutt's now a herd you see!