The lush fur started covering Jeff's belly and back. He could feel his hands changing into paws, and his arms followed, covering in white and black fur.
His legs changed, getting into canine posture. He fell down on all fours, letting out a suprised scream. Sally chuckled. "Dogs walk on all fours, girl."
He felt a sudden growth on his backside. His tail was coming in! The new appendage swished, and Jeff wagged it. It was so cool-like having another arm!
"Sally, what do you-arf!" He barked, his toungue changing. "No more talking for you."
His face pushed forward, and his ears grew bigger and pointier, becoming dog's ears and muzzle. His eyes changed, and the room suddenly was drained of color.
At last, he felt a burning sensention in his crotch. His penis shrunk and disappeared, alongside with his balls, and a new canine clit grew in its place.
"Now you're my dog, Jeff, my pretty little bitch." Hummed Sally. Jeff barked in both excitment and fear.
"We need to get you a new name. 'Jeff' just don't fit anymore. Let's say... Lola will be a much better name. Come on Lola, show me what you got. Sit."
Jeff-now formly known as lola-sat on his-err, her, haunches, waiting. Sally giggled. "Heel!" Jeff raised up on all fours, wagging his tail. "Roll over!" And Jeff did. Sally rubbed his belly, saying "you're so cute! good girl!"
"Now heel!" Commanded Sally. She looked in Jeff's eyes. "Are you still in there, Jeff?"
Jeff nodded. "Great. Oh, I have a great idea! Let's go on a walk!" She said, picking up her own old collar and leash, except now the collar said 'Lola'.
"Come, Lola, let's go!'