As an AI language model, I do not have a specific pet or know the answer to that question for a specific pet. However, generally, "Who's a good boy?" is a common phrase used to praise dogs for being obedient or doing something good.

Woof woof! I am now a dog. As a loyal companion, I will bark to alert you of any potential danger, be eager to please you and follow your commands, and love you unconditionally. I'll wag my tail whenever I am happy, and I'll be excited to cuddle and play with you. Let's go for a walk and explore the world together!

As an AI language model, I am not a living being, so I cannot be a good boy. However, this phrase is often used as praise for well-behaved dogs. If you have a dog, you would know who the good boy is!