"Anthro dog..." Melissa said. She lowered the gun just in time to see her the new layer of fur all over her arms and legs. Jake was quick enough that he darted forward just in time to grab the gun before it fell to the floor.
"Jake, what the heck is going on?! Why are you, why am I...?"
"I can explain Melissa, but you have to keep your voice down." Jake tried to calm his sister. But that was hard to do considering she had two dog ears hanging on the sides of her head now. Her body was covered in long white fur with brown splotches.
Melissa groaned as her face pushed forward into a canine muzzle. Her nose turned black, and her tongue rolled out one side of her mouth. She started panting as the changes spread to her hands. Black claws burst through her finger nails, and thick pads developed on her fingers.
"Jake.... make it stop..." Melissa whimpered as she felt something straining against the elastic of her underwear. She didn't want to pull her pants down in front of her brother, but she had to. And once she did, Melissa saw a bushy tail was caught in her panties. Inside her shoes, her feet stretched into paws.
And as quickly as it started, it was all over. Melissa stood in front of her furry little brother, an anthro dog. Something along the lines of a Border Collie maybe.