I was working on a possible 6th grade science project with my niece, and found this web site. Of course I had to do all the tests with my 3 dogs- a 9 year old Golden, a 3 yo Rat Terrier and a 1 year old JRT.  The Rat Terrier, Beemer, did the best on all the tests!!! Unfortunately, another child picked this project before my neice could, do we don't get to do it as a project, but it was kind of fun to do.

here's the link to the directions:

http://www.sciencebuddies.org/science-fair-projects/project_ideas/MamBio_p012.shtml