The Mad Dog of the Duke's Estate

I lived my whole life as a slave, bound by a leash. But there was one thing that I was able to choose for myself: the place where I would die.
"...Any last words?"
My only friend asked me in a calm voice, and I quietly replied as I closed my eyes.
"Waaaah!"
...Waaaah?
To cut to the chase, I was reincarnated. And not just as anyone, but as my friend's youngest grandson. So, what am I going to do now? Well, what else can I do?
"I’m going to cause chaos."

(Source: Wuxiaworld)