Do they have this in the States?
https://www.borrowmydoggy.com
That's what I do in the UK. I have a cat but sometimes it's nice to walk or play with a dog but without too much responsibility. It really helps the owners out too. There's another thing called the Cinnamon Trust where you foster or help look after people's dogs when the owner is in hospital or too sick to take them for a walk. Might be good to look at different ways of having the fun of a dog when you want to, but without the stress of ownership.