I agree Aard, as much as i think Rotweiller's are great dogs, I don't see one being appropriate for his situation. Plus, he's considering getting one that is a puppy - they are tremendous athletes, with incredible stamina - so for the first 3 or 4 years, he or she will be a handful. Surprisingly, some dogs that people think require a ton of exercise do not. A Whippet for instance, only requires about a 10 minute run per day, then they are done. Whippet's are tremendous dogs. Plus they can jump about 5 feet straight up from a stand still, might be handy getting them into the cab!