Hi everyone, my English Mastiff has started to do some damage in our home. His 9 months now and last week he started to bite the wall corners and the wood trim on the bottom. I just went upstairs to do a couple of things and heard this loud scraping noise and went down stairs and saw the damage. I yelled at him and told him no, he has since done another corner wall. It's not like he doesn't have any chew toys. I buy him a toy every time I get his dog food, and it's not like he's left alone for hours on end. Not sure what to do and why he's doing this. I still love him anyway and the damage is fixable, just don't want him to continue to distroy the home. Any advise on what to do ?? Thanks in advance.