Ditto here!
Like everyone else, lifespan and health are biggies! Our babies are subject to so many awful ailments such as cancer and heart problems. I know personally because we are going through this with Titus, who is in remission with lymphoma. I know despite the fact that he doesn't act or look like a sick dog, our days with him are numbered. I try not to dwell on it too much, but know we probably have a year or two at best - and he's only 8 right now! So yes, I would take away the health problems and make them live a lot longer. I would gladly put up with the flying boogers and gas just to have them around longer. Walls can be washed and the air clears up in a minute!
Cheryl, Titus and Lady