Some years ago I had an office in an incubator, and me and a guy from another company had a competition on who could come up with the most ridiculous yet somewhat believable pitch. He won with this:
Dogwalking is big business - there are more rich people with dogs than you would dare dream of, and they all need to have their dogs walked. On the other end of the leash there are social welfare clients that want more money from the state - and if you have a dog you get a monthly allowance to buy dog-stuff and food. So the ingenious business proposition was to make money by walking rich people's dogs, and renting them out to welfare clients that only need a dog for half an hour to prove that they do indeed have a dog that they can claim dog-welfare money for.
I don't know about "big business" but I could imagine a startup that made it easier for dog owners to find a person to walk their dog. In Boston, most people charge $15-30 a walk depending on length and whether it's a group or individual, so money could be made by handling transactions and charging a small fee.
Would add value by providing customer reviews and rankings.
