He might be a little immature, but don’t let those puppy dog eyes fool you. He is a master bamboozler (and a petty dabbler in the bark arts).
Heckblazer was the start of this whole thing. I sketched a golden retriever puppy version of John Constantine one night, and my friends absolutely loved him. Many encouraged me to expand upon the idea, and it quickly became a comic book.
See him here: