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heart attack
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hearing dog
hear·ing dog (plural hear·ing dogs)


noun 
Definition:
 
help dog for hearing-impaired person: a dog trained to help a hearing-impaired person by indicating that it has heard a sound such as the ringing of a telephone or doorbell
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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