This is a serious problem that some lawns may be susceptible to:
Personally, I'd have no problem forgiving Fido.
The Dirt Doctor- Howard Garrett - Dallas area organic gardening guru. Howard Garrett has a radio program called "The Natural Way" which is fantastic He also has a whole raft of fabulous videos related to gardening over on YouTube. If you garden at all, definitely check out his site and videos. He has some great recipes for natural pest and weed control, and they are almost always cheaper and way less toxic than the storebought chemical versions of same.