U.S. President Calvin Coolidge was the son of a minister. He liked to tell the story of how people were intrigued by his thin father riding astride his hefty horse. His father would explain: “I feed the horse. My congregation feeds me.”   It now appears that the gap between humans and their pets has narrowed. Since the early twentieth century Americans have become increasingly obese. But their pets have remained more or less healthy and active. But in its fourth yearly study, the Association for Pet Obesity – just imagine that such an organization exists! – has determined that 53% of U.S. cats are obese compared to a mere 19% four years earlier. The same change has affected dogs. 55% are now obese compared to only 10% four years earlier. It appears that as people become less active, so do their pets. It is another example of how personal conduct affects others.