I heard about this but it was a big email hoax. I have not heard any updates on these lately, but I did find an article on the ASPCA's website from 2004. Below is the link where the ASPCA commented on these rumors. This rumor came out the same time my Jack Russell died. I was relieved this was a rumor.

http://www.aspca.org/site/News2?page=NewsArticle&id=16054&security=2220&news_iv_ctrl=1400

I hope this helps!!!