"Rex the Matadog" from The Adventures of Rex the Wonder Dog #36 (DC, 1957) by Bob Haney, Gil Kane and Bernard Sachs
Olé! (Yeah, I should be put down for the above pun. I beg your forgiveness.) Rex the Wonder Dog was an awesome dog strip from the 50s (with Detective Chimp back-ups!) that lasted 46 issues, eventually dipping a little too deeply into science fiction, but originally based on adventures of doggie heroes like Rin Tin Tin and Lassie, except on a more global stage, constantly parachuting into dangerous situations around the world. I'm a cat person, but I'm all about Rex.