I have two tamaskan puppies who are 7 months old and already at 75 lb (around 34 kg) each. They love to gallop around the house and body-slam each other into the walls. It was fine while they were little, but now they're knocking over trashcans and chairs and I'm legitimately worried that they're going to knock a hole in the wall.
I walk them for two hours, but that doesn't stop them from running around before the walk nor from starting to run around again after resting a little while after the walk.
I'm on the verge of tethering them to each other so they can't run around the house because I don't know what else to do short of locking them up in the crates, which is sad and confusing.