Chad woke to the approaching sound of boots and the scent of Master Brad. He shook his head. What day was it? Damn, what had Brad done too him? He remembered being human, but his memories were disjointed. "Brad's patented brain box" it was electrodes jammed into poor dog's skulls as part of Brad's special training. He must've used it on Ch-Rex. He concentrated, his name was Chad, but he had to answer to Rex. Master Brad had been his brother when he was human, but Master Brad was going to treat him like any other dog because that was what he was now.
Chad assumed the present position. He was going to be such a good dog, Brad would change his mind about keeping Rex as Max's pet/mate. He raised his head, stuck out his chest and froze.
"What the fuck, Cha- I mean, Rex?" Brad blurted out as he got a good look at his latest trainee.
"Did I do something wrong, Master Brad, sir?" Chad whined in English. He spoke that meant he must be a man faced dog again. He looked down at his paws. They were bigger than before. He compared it to the wooden slats on the stall door. He was bigger. Was he changing back into a man?
"Oh. I get it. The spray combined with Max mounting you reset your DNA from Pitbull to Mastiff," Brad said thumping his forehead. "Well, I may have to revise my training plan for you, Rex. Pitbulls are in more demand on the dog fighting circuit than mastiffs are. Wonder if Max's intentions might change your gender too?" Brad said rubbing his chin thoughtfully.
Chad's maw hung open, and his eyes widened. He broke stance and looked between his legs. He looked up in relief after seeing his maleness still intact.
"Tch, tch. Rex, you broke your pose without permission. Max, your new sex toy appears to want your attention."
"Woof, woof!" Max barked, "woof, woof!"
But Chad understood and heard Max barking, "Fuck Chad! Fuck Chad!"
The pen gate opened, Max charged in. Brad closed the gate, and snickered as Rex yowled as Max knotted his latest Beta. Brad knew Rex would be yowling quite a few more times. He had dosed Max with the canine equivalent of viagra before heading to the kennels.
Later that day, Brad reappeared with a pair of leashes. Chad was a fawn colored Neopolitan Mastiff to Max's black Neopolitan Mastiff- they looked like brothers from the same litter.
Brad loaded Chad with Max's help into the back of his kennel van. The back of the van was basically a giant animal crate. The doors closed. Brad sat in the driver's seat on the other side of the metal screen imprisoning Chad with Max. Vroom, the car raced out to the highway. Max pushed Chad onto the floor of the van, and lay on top of him. So Chad couldn't see where Brad was going.
At last they arrived. Brad opened the back door. He grabbed the ends of the leashes. Then he ordered, "Up, Max. Up, Rex. Come, Max. Come, Rex".
Chad was surprised to see they were at their dad's veterinary clinic.
Chad soon found himself in an exam room being examined by his unknowing dad, while his brother Brad and his dog Max watched.
Chad was prodded, jabbed, injected, and anesthetized. He wasn't asleep, just immobilized. He was chipped with Brad's ownership information. He heard Brad and their dad discussing Rex. He had been vaccinated, chipped, been examined with an endoscope, and now his dad was getting ready to do a DNA test, and collect sperm for analysis.
"If Rex turns out to be a pure breed, he should be a good stud," his dad said as he jerked Chad's cock. His dad held up a collection bottle filled to the rim, then capped the bottle, and said, "Rex's semen is a good healthy color and viscosity is good. The lab will tell us if the sperm are healthy, and the DNA test will tell us if Rex is a purebred. We should get the results in a week or two. Then we can begin collecting semen to freeze for stud fees before I cut his nuts off. You're sure you want him neutered even if he is a stud?"
"Oh. Yeah," Brad said rubbing his hands together with undo eagerness at yhe idea of having their dad cut his brother's balls off.
Chad whimpered softly, as he lay paralyzed on the steel exam table.
Brad knelt down to look into Chad's eyes, while his father rushed to get the vial of Rex's sperm to the front desk before the lab pickup driver arrived.
"Yo, Rex, don't whimper, you won't even miss these things after pa cuts them off," Brad said as he cradled Chad's canine scrotum in the palm of his hand. He continued, "It's not like you'll ever use them again as Max's bitch and my cock hound."
Chad whined in response. There was no way he would ever suck Brad's cock.
The paralyzed dog was carried out Brad's van by Brad and his other brother Dylan. Max joined Chad in the back. He shoved his snout in Chad's crotch, ass, belly, back and face. He seemed to be genuinely concerned about Chad.