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This is a video that shows a deaf man that taught his cat to use sign language to ask for food. It will melt your heart!
https://video.search.yahoo.com/search/video?fr=yset_ff_hp_cnewtab&p=deaf+man+teaches+his+cat+sign+language+to+ask+for+food&type=default#id=51&vid=67e32a417cbeeace94d7f9dc4feffc0e&action=click