Hi! I have a 15 week old boxer pup who we are crate training. It is going very well, but I'm not sure of how long we can leave him. We crate him while we go to work and at night. I have to leave work and come home to let him out. We started him at only 2 hours and have worked up to 4.5hours. Am I on the right track? How long before I can leave him all day (max 8 hours) while we are at work? He is sleeping through the night now which is about 7-8 hours without going out. Any suggestions would be great. Thanks in advance!