My french mastiff is almost 2 years old. He got neutered at the age of 1. Is there a way for Duke (my dog) to not be so mean towards people? We used to have people come inside and now he barks and almost wants to attack anyone who enters the house and can hardly every have house guests now. Is there anything to do to make him more social towards people? Even on walks he has become very mean towards strangers even when I say its ok to the dog.
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https://mysmelly.com/content/dogs/how-to-become-the-alpha-dog.htm
Have you considered inviting a dog behaviourist?