Most dogs can be trained pretty well - they can learn commands and tricks, so you can shape their behavior the way you want it.
Meanwhile, some habits can't be changed, so you can only learn to deal with them.
Here are a few examples of such things.
Dogs have certain behaviors built into their nature, like digging or barking.
It's tough to make them forget these natural habits because they're part of who they are.
Things they learn as puppies can be really hard to change when they grow up.
So if they learn to be afraid of something or to do a certain behavior when they're young, it might stick with them.
If a dog keeps doing something over and over, like jumping on people or chewing on things, it can become a habit that's difficult to break.
If a dog is scared or anxious about something, like thunderstorms, they might always react that way, and it's tough to make them unlearn that fear.
How a dog behaves around other dogs or people can be hard to change, especially if they've learned to be aggressive or shy.
So, just like it's hard for us to forget some things we've learned or habits we've formed, dogs also have certain behaviors that can be really tricky to unlearn or change.
It takes time, patience, and training to help them adapt to new habits.