When someone operates their own business, that's entrepreneurship. Whether your dog-walking service is successful or not, starting it will teach you a lot about entrepreneurship!
Entrepreneurship means taking on the risks and challenges of running a business, and the people who do this are entrepreneurs. The first people described as entrepreneurs in English managed theatrical productions; the word's root means "one who undertakes or manages." Today, entrepreneurship involves investing time and money into a business idea, with the hope of profiting financially from it.