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Much of the debate surrounding service animals in public spaces has to do with how well-behaved the animal is and whether the animal is experiencing an undue level of stress. While many behaviors can be trained, some natural ability and inclination for the task expected of them is also required. For example, a 10-lb Chihuahua would not be expected to pull a wheelchair; and a dog uninterested in environmental noises could find it challenging to rouse from a deep sleep to alert a hearing-impaired or deaf person. Read article .