I think the first thing to do with a new puppy, or new dog in the house, is to show the newbie who is the pack leader. Dogs, like teenagers, need clear instruction on what the rules are and who sets them.
You don't have to spank them. Or with particularly unruly dogs, you don't have to spank them a second time. Slapping your palm with a rolled up newspaper, or a sharp clap, with a sharp 'NO', sometimes with a timeout in a 'bad' corner is sufficient. And, obviously, when the dog does what s/he is supposed to, sweet excited praise, with or without a treat goes a long way to molding behavior and making the dog feel good about himself.
A particularly headstrong Lab came to stay with us for two weeks. His owner is a firm believer that if you repeat your "command" often enough, the dog will stop pretending to ignore you.
When I said "Bunson, Come" (he's a Lab, get it?) a command he knows, in a firm voice and he ignored me, I walked over grabbed his collar and walked him back to where I was sitting. Still holding his collar, I grabbed his nose with the other hand, and gently put my teeth on his muzzle. I held it for a few seconds, until his tail dropped, and then pushed him away. It's how the leader of a wolf pack communicates leadership. It doesn't hurt the dog, but the message is unambiguous.
Three things to be careful of: you have to mean it. If you're ambivalent the dog will know it. You might get dog hair in your mouth. And don't do it on a rug - the dog might be a 'submissive peer'.
The next time I called Bunson, he came. And got a treat and a kind word.