Wow! I'm glad I read this. I have a GWP pointer and I never thought it would be harder on him than me. I take him with me just on exercise walks a couple times a week just to keep us both in shape but we are BOTH pretty old and walk 4 miles most outings. He does about 3 times as far as me walking out but slows down when we turn around.
I was thinking about starting to use the bicycle just to let him do a little more with out lapping me. It has been getting in the 50's here at night now. Would it really kill him before he just takes a break?