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May a transit entity limit how many service animals may accompany a single passenger?

No. Department of Transportation (DOT) Americans with Disabilities Act (ADA) regulations do not limit the number of service animals that may accompany a single individual. As long as an animal meets the definition of a service animal and is kept under the control of the rider, a transportation provider may not refuse to carry the animal. It is possible that an individual might have service animals that are trained to provide different tasks.