If a bar owner believes that a service dog is disruptive or dangerous, they must first try to resolve the issue with the dog's handler. If this is not possible, the bar owner may exclude the dog from the premises. However, the bar owner must be able to show that the dog is actually disruptive or dangerous, and that there is no other way to resolve the issue.
In some cases, a bar may also be able to exclude a service dog if the dog's presence would fundamentally alter the nature of the business. For example, a bar that is known for its lively atmosphere and loud music may be able to exclude a service dog that barks or whines excessively. However, the bar owner must be able to show that the dog's presence would actually interfere with the business's operations.
If you are denied access to a bar with your service dog, you may file a complaint with the Department of Justice. You may also be able to sue the bar owner under the ADA.