In a top-secret laboratory, scientists in the fields of zoology and genetic engineering try to make a solution that would turn animals anthropomorphic.
Why? Well, their employers won't really say. Some scientists theorize they want soldiers while others joke they are just really enthusiastic furries. In any event, the pay is good, so they don't ask too many questions.
After much research and experimentation, the scientists made a breakthrough. The concoction they came up with could be injected into any animal with a vertebrate and turn it into an anthropomorphic creature.
The process wouldn't be instant though. It would take around a week to finish, during which the transforming animal could acclimate to its new form. First, the animal's mind would expand to human levels, although knowledge would still need to be learned at this point, which is why the scientists got animals that were either trained or showing high intelligence for their species so that the post-anthro learning process could be shortened down. Next, the physical transformation would begin. The hind legs would adjust to bipedal locomotion (and foot placement would shift to plantigrade for some species), the forelimbs would gain opposable digits, and their heads adjusted for vocal communication and facial expressions, including some species having their eyes move from the sides of their heads to the front.
The resulting anthro would still be more or less the same size they were as a feral animal. This, along with unique body proportions, means their clothes would have to be custom-made for each species, though they hope that making clothes for more general species families in mind like mustelids, canines and felines will be good enough.
After checking over their notes and making sure they are ready, the scientists inject their anthropomorphization solution into a...