You may get the FREE dataset of human's or cats' faces from:
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VOC 2007: PASCAL Visual Object Classes Challenge 2007 http://www.pascal-network.org/challenges/VOC/voc2007/workshop/index.html or http://pascallin.ecs.soton.ac.uk/challenges/VOC/voc2007
but it's seems that it doesn't work in China
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Caltech Faces 1999: http://www.vision.caltech.edu/html-files/archive.html
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Micresoft Reasearch: Microsoft Cat Dataset 2008 by Weiwei Zhang, Jian Sun and Xiaoou Tang http://137.189.35.203/WebUI/CatDatabase/catData.html but it's seems that it doesn't work in China