I really want to go over seas in a few years to travel and work. By the time I'm ready to go my chow/golden mix will be 11 years old. Is it safe for a dog that old to take a ~20hr flight? Its possible for me to leave him with family but I don't know how long I'll be gone. I don't want my little stinker to kick the bucket waiting for me to come home. At the same time I don't want to pay a few thousand dollars to transport him and not have him make it. Does anyone have experience traveling with old dogs?