Dog meat in Manila
El jefe is right. It is illegal in Manila--and, I believe, in the rest of the Philippines, so you won't find it in a restaurant.
Most Filipinos today would be horrified at the thought of eating dog. Any place that would serve it is someplace that should probably be avoided for reasons to do with your own health: the standard of hygiene in underground eateries is pretty bad and e.coli, h.pylori, salmonella, and hepatitis should be considerations even if you don't care under what conditions the dogs were raised and slaughtered--or that some of them might be lost or stolen pets.
I think you're barking up the wrong tree here. (Oooh, that was really bad.)
And "good dog meat" is an oxymoron.
Although I don't encourage it's consumption, I've posted on this Board where to get dog meat in Vietnam, China, and Thailand. I'm sure dogs are eaten in some parts of the Philippines, but it's definitely illegal to kill or sell dogs for food in Manila. Of course, that doesn't mean it can't be found, but a western-based public website like this probably isn't your best source.