Yes! And no?

"Neigh!" Ann said. "Harder, owner, harder!"

"Um, what?" Makoto asked in shock.

"I said I want you to smack my butt with the crop harder! Neigh!"

"Ren?" Makoto said.

"I heard that sometimes this happens," he told Makoto. "The person regains their ability to speak, but still thinks they are an animal."

"Meowner," Futaba purred, wiggling her butt. "I want some tunya."

"Keep treating them like animals," Ren said, stroking under Futaba's chin.

Makoto nodded fiercely and smacked Ann's ass harder with the crop.

"Neeeigh!" Ann cried, rearing up.

"Oh, meowner," Futaba moaned as Ren stroked her belly. "Feels so good, nya!"

Makoto wondered what this disease was, and why she had never heard of it before Ren told her...