Boomer happily chewed down on the treat, which Mark had slathered in the liquid from the vial marked ‘human’. After swallowing it, the German shepherd made an expression, which Mark assumed was one of disgust. A couple of moments later, Boomer yelped, and fell into his side on the kitchen tile, shaking. Mark gasped as he watched his dog’s limbs lengthen and straighten out with a series of cringeworthy cracking noises, as well as thicken up a fair amount, until his front legs at least were about the same thickness as an average human arm, as well as his back legs being slightly thinner than a regular human leg. His tail started to shrink and retract into his body, and his fur began retracting until it was only left on Boomer’s front, legs, and head. His torso bulked up and stretched, his skeleton crunching loudly as it entirely changed shape, and his paws stretched out and split into five human fingers or toes on each hand or foot. To Mark’s surprise, Boomer pushed himself off the ground, and stood up on his now human-like legs, standing at about the height of Mark’s chest. Boomer audibly grunted as he experienced another growth spurt, causing Mark to step back as he was stretched to become just an inch or so shorter than Mark was. His shoulders shifted wider, so that his now human arms could hang beside his chest, which contorted into that of a regular human male. Boomer let out an unsettlingly masculine moan as his penis lightened to a pale pink colour, the head rounding off, the knot smoothing out, and the sheath pulling up his shaft to become foreskin. His muzzle was retracted back into his face, and his new nose pushed itself out to replace it. Boomer smiled, as his face was rearranged to become oddly handsome to Mark, and his ears shrank and rounded out as they moved down to their correct position. The fur on his face disappeared, except for that around his mouth, which was trimmed into a short beard, and that on the top of his head, which grew out to become a slightly curly, short, trendy hairstyle. Finally, Boomer’s body gained a significant amount of muscle mass. His biceps swelled up, his chest grew to have two slabs of muscle for pecs, his abdomen contorted into a perfect six-pack, his ass grew and became perfectly round, and his legs thickened into those of a professional cyclist. Boomer cracked his knuckles and rolled his head, before looking directly at Mark, who could barely take in his dog’s new human body, which could only really be described as, well, sexy. The cherry on top, of course, was his well-above average 9-inch penis which dangled right in front of him. In a tone deeper than Mark was expecting, Boomer chuckled with a smirk, “Well, this is new.” Mark blushed, “Yeah...” before clearing his throat. “I suppose Boomer isn’t a very fitting name for you now, maybe something like, uh... Brody would be more appropriate?” Boomer placed his hand on his chin for a moment, pondering, before grinning, “Sounds good! Brody... I like it.” Mark glanced down at the vials, and picked out out which read ‘Clothing: Fit to User’. He walked up to open Brody’s mouth to pour some in, to which he happily obliged. Out of nowhere, a tight compression t-shirt covered Brody’s torso, if you could call it covering, some gym shorts provided a bit of decency, and some sort of designer trainers appeared on his surprisingly large feet. Brody laughed, “Fresh.”