Puppy 100x calmer within 1 week??

My puppy Hank is 4.5 months old. When we first got him, he was a little menace lol, but I loved him. Peed in the house all the time, loved to bite and chew on everything (my feet were his favorite, I have scars to prove it), just rambunctious puppy things.

About a week and a half ago he just suddenly got wayyy calmer. He barely bites me, and I can’t remember the last time he peed in the house. He is just such a sweetie now. His favorite activities have been laying in my lap and laying in the sun.

Isn’t this a bit early for a dog to calm down? Or are bassets different than other breeds since they are generally a calmer dog?