Dog Age Calculator

There's a number you've probably said out loud at a dinner party. Someone asks how old your dog is, you say four, and then almost involuntarily you do the math in your head. Twenty-eight in human years. You say it with mild authority. Everyone nods. Nobody pulls out a dog age calculator. Nobody questions the formula. You were wrong. Not a little wrong. Fundamentally wrong. The multiply-by-seven rule is one of those factoids so tidy, so satisfying, that nobody ever stopped to check it. Like the idea that we only use 10% of our brains, or that lightning never strikes twice it sounds like something a scientist would say. It is not. It is, best anyone can tell, a rough marketing statistic from a time when the average human lifespan was about 70 years and the average dog's about 10. Someone did the division. The myth was born. No dog age conversion chart. No breed size adjustment. No science just arithmetic wearing a lab coat. Modern biology is considerably less tidy. And...