Observe whether the dog is under control and well-behaved in public
Look for signs of training such as focused attention, calm behavior, and ignoring distractions
Check whether the handler can answer basic questions about the dog’s tasks if appropriate
Notice if the dog is wearing gear that is decorative rather than functional
Be aware that a vest, patch, or ID card alone does not prove a service dog
Watch for disruptive behavior such as barking, lunging, sniffing, or begging
Compare the dog’s behavior to the setting and task it is supposed to perform
Verify only what the law allows; do not demand medical details or special papers
Ask only permitted questions if you are a business owner or staff member
Document specific observable behaviors instead of making assumptions
Report concerns to the appropriate manager, landlord, airline, or venue policy contact
Focus on compliance with access rules rather than trying to “catch” someone
Treat all animals and handlers respectfully while addressing legitimate concerns