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It's not just the size that makes an assistance dog. There are several types, guide dogs for the blind are just one of those. The guide dogs tend to be larger breeds, but with very stable and steady personalities. Part of their training includes doing things like interposing themselves between their owner and something dangerous.
Smaller breeds are used for other service types, such as assistive dogs for the deaf (let their owners know when the phone is ringing, door knocking, fire alarm going off, and so forth), as well as for persons with physical handicaps ... the dogs can bring needed items to them, or pull a cord to turn lights on and off.
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