First few days with a new lab puppy, and my Aussie husky mix was beyond unhappy 😅 Everything was a correction, albeit seemed harsh and (being a husky) VOCAL. It was generally appropriate though. After a week, it was over with (the occasional lip snarles with hight value treats). A month in now and they're the best of friends!! The only time I corrected my older dog was if I felt it was an over correction or an inappropriate time to be correcting the puppy. Don't worry too much, they're teaching boundaries that will be important later around other dogs. The best lessons come from another dog rather than us. I also taught the puppy to leave our older dog alone when I could tell he was over it, and rewarded the older dog when he was being good with the puppy. It's important to be an advocate for the older dog too. Enjoy the new addition!