I have recently started a DIY pet blog called Bloggie Stylish where you can find cool tutorials like this one.
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http://www.dogsincanada.com/tennis-ball-hazards
http://answers.yahoo.com/question/index?qid=20080623132452AAxL9Ei
http://tennis.about.com/od/faqballs/f/faqballs13.htm
This website suggest it might not be the ball itself, but the dirt it collect:
http://sitk9sit.blogspot.com/2009/10/are-tennis-balls-good-for-your-dog.html