Its a good and interesting read....

http://islam.thetruecall.com/modules.php?name=News&file=article&sid=296

A good deed done to an animal is as meritorious as a good deed done to a human being, while an act of cruelty to an animal is as bad as an act of cruelty to a human being
The Prophet Muhammad: Hadith

http://www.think-differently-about-sheep.com/Why_Animals_Matter_%20A_Rel...