New Delhi, Aug. 22 -- Almost 20 years ago, a dog walked into our life-me and my wife's-and changed everything. She was emaciated, almost at the point of death, and we saw her walking slowly, painfully, down the road from the balcony of our rented apartment. We rushed to feed her-something, anything.

We did not know then how that one act would transform our lives, become an almost all-consuming passion, a mission, and the very definition of who we are.

We are feeders.

We take responsibility for 80 dogs in our neighbourhood. Which means that we have sterilised each one of these 80 dogs and we vaccinate them every year. At first, we did this with our own money. Later, as some people in the neighbourhood learnt about what we do, they kindl...