Hello Customer (name blocked for privacy),
I spent over an hour searching on the Internet to find any useful info however I believe the only reliable info can be found on the website of Department of Defense Military Working Dog Center and there's no specific info on Sentry and Messenger dogs on their pages. Here is the page to their Work Statement where they describe the breeds accepted, the page is intended for potential vendors:
http://dodmwd.lackland.af.mil/vendor_a.htm
Also on the same page you can find their contact phone numbers:
1-800-531-1066
Department of Defense Military Working Dog Center
http://dodmwd.lackland.af.mil/
webmaster@dodmwd.lackland.af.mil
Hope this helps, have a great day!
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