Large dog breeds need to be trained very carefully. My friends have a 100 lbs husky, just a massive wolf looking dog. When he was a pup, he was food protective, so they made sure to train that behavior completely out of Steel(the dog).
In the present day, Steel is 8 years old, in the prime of his physical size and health, and the sweetest boi. With different owners, he'd have negative habits that lead his behaviour and made him dangerous.