I have completed over 600 walks for Wag! in a top-20 size city.
You can work whenever you want, you are your own boss, hang out with dogs, normally get tips, direct deposit weekly, can make good money for the time you spend.
Ultra competitive, they make you pay for your own background check, Wag takes 40% of owner payments, inconsistent, going in blind to random houses/dogs, lots of driving/mileage, you're kind of on your own if you run into problems (though it has gotten much better), you will be stressed out if this is your main source of income
I would only recommend Wag! to people who are just doing it for fun/want to make part time money, unless you live in a huge city. (I do not mean Boise or Des Moines, I mean HUGE cities like NYC, LA, Chicago, DC, Seattle. Do some digging to find out Wag's presence in your city. I have heard people say that big cities like Portland/Vegas can be very slow. I have heard many people say Wag is looking for walkers in their specific city but there are no owners signed up yet, so check this out before you pay them for your background check.