Pros
The pro of using Wag is that you get a couple dollars to keep your body moving.
Cons
Sometimes it can prove difficult to manage your own time with variabilities on these walks. In an apartment complex? +10 min to find it. Stomach wrapped harness and a nervous dog? +15 min to soothe the dog to they'll let you put it on. Excited dog home-alone without even a collar?? +15 minutes attempting different strategies to get close enough to put on the harness.
Owners do not always provide poop bags.
The app could be better - there are several alerts and reminders that are needlessly repetitive when you use it regularly. You have to click through the same 5 reminders before every walk to get the access information. I understand it was designed for safety, but it just adds minutes (one at a time) to your day for no reason.
There doesn't seem to be any lock-screen widget for the app, so you have to unlock your phone every time you need to log a pee, poo, or check how much time is left on the walk.
Wag a big chunk of the earnings. I believe it's about 40%, which is a LOT. An actor's agent only gets 20%.