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In page Service animal:

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Guide horse users report they typically are immediately recognised as a working service animal, whereas a dog may be mistaken for a pet.[citation needed] Miniature horses have been praised for their excellent range of vision (350 degrees), good memories, calm nature, focused demeanor, and good cost-effectiveness.[4] They are cost-effective primarily because their long working life, of about 20 years, is so much longer than for other animals, so the longer training period is balanced by the longer service time.[3] They are particularly well suited to guiding people with no or low vision.[3]