Bethany, a 28 year old woman, was doing her daily routine of going around the breeding centre feeding the dogs. Many breeds of dogs were kept there in separate enclosures and cages, each producing off spring that could be sold off to families wanting puppies. Bethany worked mostly with the dogs so she got to know each and everyone of them perfectly, to the point that many of the dogs just enjoyed spending time with her.
Across the rest of the centre were some of the other workers. Up front at the desk was a small Asian woman called seiko and an afro-American woman name Shakira. Down in IT and dealing with the centres page was a group of 5 or so men. Working mainly with the dogs was Bethany and her husband Jack. That was typically who worked at the breeding centre.
It was just a regular day for Bethany when Jeff hit the button on the chronivac. At first a wave of strange sensations wrapped around Bethany for a few seconds, a sign that the effects were happening already.
Bethany didn't notice anything of at first. The dogs were running around as usual with their shoes on while she did her work barefoot on the ground. Her mind thinking it was normal for things to be like this. Gradually things started to change even more so.
With each minute, the less clothes she was wearing. Eventually the only thing she was wearing was one of the collars they gave to the female breeder dogs, or now female breeder humans. As a sign of being a breeder female, her breasts began to balloon out towards a G cup, as the larger the females breasts, the more fertile they are. The changes were mostly done except some physical changes that hadn't happened yet.
In all of this, Bethany hadn't notice anything wrong at any point. She was currently writing on a clipboard, filling in her daily report when she felt something prodding her anus.
"Jack, I can feel that thing poking me. Is there something you wanted?" Bethany smillied lustfully as she barked the question with the fleeting English she knew.
Jack, slowly losing the ability to speak just pushed the two of them on all fours, falling down to the floor of the German Sheperd cage. Bethany didn't resist as she felt Jack's penis enter her vagina, which had now been moved to were a normal bitch would have theirs. The two began to mate, making noises that signalled they were having fun.
During the intercourse, their bodies finished their changes. Now their forelegs (formerly arms) and hind legs were both the same length and their hands now being unable to effectively grab anything.
Their spines and bones adjusted themselves to find a quadrupedal stance the most comfortable position while their trachea and tongue changes so they only could make barks and typical dog noises.
One other change with the human tongue was that it had gotten larger and longer so it could act more like a dogs, easily hanging out as panting became the typical way of breathing for a human.
The final change came with the hair, easily getting more bushy and fluffier, the hair of humans grew out in the places that it was typical to find it.
Jack had his hair grow out all across his body whereas Bethany only grew fluffed on her genetalia and her armpits, while her long lengthened hair shortened itself to a more manageable length, presumably due to the new dominant dogs trimming it so it wouldn't be in the way of Bethany.
As the two humans finished changing, so did their session of intercourse. By this time, the other cages were filled with other humans, some recognisable like a small Asian female wearing a collar with 'Sei-Sei' on it, had been placed with other asians. Meanwhile another cage filled with afro-Americans was adjacent to it and the similar sight of a female have a collar saying 'kiki' could be found being mounted by a much larger male.
Bethany, or now 'Betty' as her collar stated on it, was in a cage with her former husband, now mate. Elsewhere in the cage was other white Americans like themselves, albeit that wasn't what the dogs called them. White Americans were named 'American White backs' whilst afro-Americans were known as 'dark back labourers' and you can guess there are many other breeds too.
Now no longer breeding animals but being bred herself, Betty could only feel contempt at her position. Her old mind would hate this but her new subservient and animalistic mind could see nothing wrong with the situation. Perhaps this simpler life will be better for her.