And is that documented in any way that the dog was actually accurate that much later?
What we have here is the dogs supposedly tracked her to several places on the PALA reservations. As far as I understand it, there is no actual evidence she was ever (dead or alive) at any of these places.
So it's a good story for Nancy Grace "dogs tracked her but police didn't follow up" but in reality we have no idea if she was anywhere the dogs supposedly said she was.
The FBI dogs in November couldn't reproduce what these dogs supposedly found in August. Of course that's even later.
"In an interview a month ago, Lt. Bob Benton said due diligence was observed. Detectives went to Pala and interviewed many people, most of who were aware of Ambers disappearance but none of whom recalled ever having seen her."
http://www.signonsandiego.com/news/2010/mar/08/search-dogs-came-close-seeking-amber-last-year/