Marcy didn't say a word, but started with some of the instincts that Lady needed. Back when she was Ty, she'd considered this as a possibility, but even then hadn't been 100% sure that she wanted to stay this way, so she hadn't wanted to ruin Marcy's life.
Now, she went much further, making Lady more dog than girl. By the time she was done, the dog thought more like a dog, acted more like a dog, and behaved like a dog. She even overlaid more comfort with her position in life.
In short, though Lady remembered being a human, being a dog was now all she'd consider.
Marcy was completely honest with Lady. "You're much more dog than you were before," she'd explained. "Maybe too much."
For her part, Lady loved the change, finding now that she could spend a day or two acting like a dog and not missing being human. "All I'm missing is my mate," she'd said.
Marcy had an idea there, too. Calvin had an older brother, Tyler, that was a real pain in the ass. Marcy had considered changing him already, but this presented a good chance to simply get rid of him.
"Lady," she told her, "I'm going to allow you to pick a mate. If you find a dog you like, then simply think and he'll become my pet. If you find a human, start talking, he'll understand you. If you want him, and he wants you, then speak it and he'll become whatever mate you wish."
Shortly after, she walked Lady over to her boyfriends house, where Calvin was waiting. They were planning on doing some homework together, though Marcy hoped that anatomy was going to be discussed. Once she was sure Tyler was home, she sent a suggestion his way that he'd really rather be a dog, then sent lady to roam the house.
Lady had stumbled on the older brother lounging on the lawn. He spotted her and called her over, "How's it going, girl?" he asked. Srangley, he felt intoxicated by her scent.
Lady was taken in, too. Without thinking, she asked, "Are you to be my mate?"
Tylers eyes went wide, "You talk?"
She nodded, "I'm magical," she said, telling a bit of a half truth, "I'm looking for a mate."
Tyler, his own mind altered by Marcy to the point where he couldn't think of anything else, nodded, "I'll be your mate!"
Even as he said it, his clothed vanished and turned into a collar around his neck. He watched as golden fur covered his body and a tail sprouted. In no time, he was a fine example of Golden Retreiver!