Sgt Grit,
I think a USMC Tee-Shirt with Doberman's recognized as the real USMC War Dog/ "Devildogs" would be appropriate. See attached:
http://www.doberman.ws/ww2.php
Admittedly the English Bulldog is the USMC Mascot but the Doberman was the real hero in many WW II campaigns, he was a fighter. I have had eight Doberman's and my current Marine, Baron, is 32.5" to the withers and 112 pounds of protection and companionship.
SSGT Robert Burdoin, USMC ('52-'55)