But do humans really need to be living longer lives?
I posit not. 120 years is a perfectly acceptable upper limit to the human lifespan. Plenty of time to achieve goals, while still making room for the next person without monopolizing too much time or space.
What we could use is a more functional life time up until that upper limit. A raising of the average lifespan to that limit, and a way to make everyone that much healthier and functional - mentally and physically - right up until the final few days. Because I see far too many older people linger on in suffering with currently-incurable ailments such as Alzheimer’s or other neurological issues that radically decrease quality of life.
But yes. Dogs do need longer lives. No way in hell is 10-16 years adequate for such fine creatures who have such boundless and unconditional love for us.