http://www.iamscruelty.com/notTested.asp

In addition, IMO Natura's testing is humane and the company will send you lots of info about the program if you ask.

http://itchmoforums.com/pet-food-testing/natura-response-to-query-about-pet-food-feeding-trials-humane-standards-t3087.0.html

And I got a good response, IMO, from Wellness.

http://itchmoforums.com/pet-food-testing/response-from-wellness-omh-on-feed-trial-testing-t3240.0.html

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Other companies may do this kind of invasive testing:

http://www.nytimes.com/2007/09/02/magazine/02pet-t.html?pagewanted=1&_r=1

Also, unless adopted out after careers as food testers, dogs and cats may be sold to invasive research labs or veterinary schools.

Interesting discussion here by vet students.  Search for 'feeding trials'.

http://forums.studentdoctor.net/showthread.php?t=487097&highlight=terminal+surgeries