Our brindle male Diesel is 18 months now and is doing GREAT! He is such a great dog and is so protective of our 2 y/o son. Problem: we HATE locking him in his crate when we leave, at night and sometimes most of the day! When we are home, even all day, he is find, no accidents in the house. However, if we leave and don't crate him, he will mess in the house. Has anyone had the same problem? How can we fix this?!