I got this cute dog from a foreign friend. He became a part of the family ever since. He plays around with my kids most time of the day.  We never got to train him though and I think it was not a good idea that we didn’t. We are starting to have behavior problems with him now. He never behaves and he rips almost everything that he can have his teeth on. He keeps getting the house messy with the things he destroys and his food that he plays with, not to mention his poop and pee around the house! We tried training him beginning with his littering but he seems to never learn. After two months, nothing has changed. What do you think should we do?