Raphael was your pet mutant, instead of killing him due to how dangerous he was you put a shock collar on him with a leash. if he ever tried to run away or attack you, you'd shock him mercilessly. 2 months of this and he eventually became submissive and got used to you

You were walking down the street with Raphael on a leash behind you, he was angry as usual. He hated being around people and town was the most populated area, people around you would back away to stay away from Raphael

Raphael huffed in annoyance