The article by Ginger-Lyn Summer entitled "Dealing with the Guilt" is very good. If you're needing help with this, as so many of us do and I so desperately was (and still do sometimes -- it comes and goes), this should make you feel better. Please go to to following site to read the two-page article:
http://www.petloss.com/dealing.htm
(I hope the link works, and I'll check it out.