ULPT: Carry a dog whistle for people who bring their pets in public
Don't get me wrong, I love dogs and own many, but there's a time and place to take them in public.
We've all seen them, not the service dogs, but the obviously untrained pets that people insist on bringing everywhere in public. Now that they all cry "discrimination" against their service dogs many stores now ignore them because they don't want to deal with the hassle of trying to get them to leave.
That's where the dog whistle comes in(I'm sure there are apps for that). When you see that designer breed pulling on their leash, coming up to other customers, or "marking" their territory you can subtlety blow the whistle, driving the dogs nuts.
A few rounds of this and everyone in the business will be so upset that it'll be much more likely they're asked to leave. It's perfectly safe for everyone and the animals, but will cause a disturbance and get the offenders thrown out.