Thanks again for the help - I've joined the CanineswithCancer group at yahoo and found some good links. Samantha is about 7 years old - probably closer to 8. I've had her for about 4 years and she was at least 3 when I got her. I'm just trying to learn as much as I can before her testing on Monday. I'll start pouring through the canine cancer awareness site tonite. I've read every cancer-related post I could find here already and didn't see this link so I wanted to share:
http://www.merckvetmanual.com/mvm/index.jsp
Listing of bodily systems, diseases, etc. Good reference material.
Thanks for the good thoughts!