I keep being asked on MN about how I set up my dogwalking business, and I know I'm not the only one of us on here, so this thread is (a) so that I can type out my advice just once, and then next time I'm asked I can just send people a link to here and (b) maybe a place we can all chatter about the highs and lows of taking care of other people's pets.
I'll pm all the posters who I know do this, but anyone else feel free to join in too!