A lot of good points already made. D80 made an interesting one as well. Different kinds of hunting might be less strenuous and easier for both of you physically. When I was a kid, I remember a neighbor and his dad taking me pheasant hunting at a club that I eventually joined. It wasn't difficult hunting (physically) but I absolutely loved watching the dogs work and also got my own dog and trained him (fond memories). Getting old and/or less mobile or more infirm is not a fun subject for any of us. Maybe you should talk with your dad about what he thinks is a solution. He might have some ideas too. Good luck and let us know how it works out. And enjoy the time you still have with your dad of course.