I would have to agree with you, if the nose wasn't soo pushed in I would of guessed a natural ear Dogo.........
[IMG]http://rds.yahoo.com/S=96062852/K=Dogo+Argentino/v=2/SID=w/l=IVS/SIG=13j9f87ia/EXP=1123683242/*-http%3A//www.viarural.com.ar/viarural.com.ar/ganaderia/mascotas/pets/perros3/dogo-argentino03.jpg[/IMG]

but I think more or less Am. Bulldog, the ears aren't right for Boxer, even if ears were natural, they aren't as long..
Cute pic!