Puppies tend to live more extreme lives than the rest of us. They’re often extremely friendly, always extremely floppy, can be extremely skittish, and basically define what it is to be extremely adorable. As they grow, those extremes can transform in all sorts of ways — except, of course, the extremely adorable because they retain that forever.
Sometimes, that can mean something beneficial like they become less skittish as they gain more confidence. But sometimes, that means that their personality becomes a little less friendly to other dogs. To get angry at or simply try to force them to be something their not is unfair to you and your pup.
Adapting and embracing all the personality changes in your dog as they come about will allow you to simply grow with your pup. Having unfair expectations or attempting to change their personality will set you both up for immense frustration and constant failure.
If it’s a dangerous behavior, enlist a professional to help you. But if it’s just an annoying little quirk that you wish they didn’t have, both your lives will be way happier if you simply embrace who they are and work with it rather than against it.