Service dogs wear a vest so that they are easily identified. It is not required by the federal law, but it does make access easier. It also helps the dog differentiate from "work" and "play". When...
Remember that a vest doesn't make a dog a service dog. Claiming a dog is a service dog when you are not disabled, or when the dog is not individually trained to perform tasks that mitigate your...
in general, there could be two realistic answers to this.
The first as a joke ... none, dogs don't have feet they have paws.
The second answer forgiving the feet/paw issue and presuming you meant...