Here is a list of children's books on pet loss. Many should be available from the local library. http://community.dog.com/forums/p/22121/299097.aspx#299097 The post just above that one lists books for adults - including info on how to talk to children.

I agree with Stacita that her death was probably from natural causes. This book may help you: Sife, Wallace , The Loss of a Pet , 3rd edition , 11/2005 http://tinyurl.com/yt34zt