If you could increase the lifespan of your pet dog or cat, would you? And what is the real cost of doing so?

Last November, my family brought home a puppy. Frankie was eight weeks old when he came to live with us, and right now, watching him bound around with my seven-year-old son, I don’t want to imagine ever saying goodbye to him. Well, maybe I won’t need to, or rather, I can at least kick that day into the long grass, and buy Frankie some extra time. After all, scientific understanding of the mechanisms of ageing has never been better; there is a plethora of longevity products to choose from and more in the pipeline, including a kind of diet pill for dogs; and, thanks to research into lifespan expansion for pets over the last decade, prescription-based longevity interventions that are now approaching FDA approval. All I have to do, it seems, is put in the time, care and (lots of) cash.

But should I do so? Don’t our pets live long enough already? And whose needs would I be serving – my own or my pooch’s? In the UK, the life expectancy for a dog is just over 11 years, while cats average 14. As a working cocker spaniel, Frankie should be with us for 12-15 years – old enough that he’ll still be around when my son leaves home, just not long enough to see me into my dotage.