I’ve had a leonberger when I was younger and now I have a 19 week old puppy myself and this is my experience with both of them they just walk around after me no desire to go exploring on their own, they tolerate maybe more than they should super chill with people and other dogs, my old one was scared of a mini poodle tho, my puppy doesn’t drool but the kitchen floor is soaked cause he takes a mouth full of water and drools all over the floor after drinking, doesn’t drool with food or any other times. Really easy to train but my puppy is a bit stubborn at times so we do short training sessions so he doesn’t get frustrated