The US pet economy is worth $41bn. Yes, you read it right.This is more than the gross domestic product of all but 64 countries in the world. I am not surprised. I love cats and it is clear to me why spending on pets – nutrition, grooming, medical care etc- is booming. You can read more about this phenomenon and its drivers in the Businessweek cover story of August 6. This post is about the next $41bn and how can companies accelerate that trend.