The difference a trained task makes for public-access rights

This is a composite, illustrative scenario, not a specific handler's story, walking through how the ADA's task requirement plays out at the door of a business. The situation: A person with a panic disorder brings their dog, trained to interrupt panic attacks through deep-pressure grounding, into a restaurant. Staff initially ask them to leave, assuming the dog is a pet. Under the ADA, a business may ask only two questions: (1) is the dog required because of a disability, and (2) what task has it been trained to perform. They cannot ask for documentation, demand a demonstration, or ask about the specific disability. A dog qualifies as a service animal under the ADA specifically because it's trained to perform a task tied to the handler's disability. An ESA, by definition, does not meet this bar no matter how comforting its presence is, because comfort alone isn't a trained task. The typical resolution: once the handler answers the two permitted questions, the business is legally required to allow the dog in any area the public can access, with narrow exceptions (genuine safety risk, or the dog being out of control and not corrected). A PSD letter itself isn't shown at the door. It exists as documentation for situations like housing, employment, or air travel, where more formal proof is reasonable to request. What this means practically: this is exactly why we ask what specific task a dog performs before issuing a PSD letter rather than an ESA letter, because the legal rights that come with each are genuinely different, and getting matched to the wrong one wouldn't hold up if it were ever questioned.