Well, with your dog poop comment...
Beginning: cost of transport, business cards, plastic bags, rubber gloves, maybe a mask, old boots, throwaway clothes. Go make a name for yourself with service and dependability.
Get to the point where you have so much work you need to hire an employee.
Get to the point where one employee becomes five, ten, etc. You stop actually picking up poo but run payroll, billing, accounting, advertising, scheduling, service complaints.
Get to the point where the business is profitable enough you can pay a manager to do all that stuff, too.
I wouldn't think you'd need a franchise for dog poop removal. People specifically go to XYZ burger/coffee/fried chicken place because they're consuming a product and they want a familiar taste and experience. Dog poop removal is a service. Your customers aren't tasting or experiencing anything (except noticing a clean yard.) I can't imagine the yard looks cleaner because they used brand-name poo removal services.