I don't know who does these simple and great bulldogs but I've seen a couple round town. This one was in Rivington Street but I've also seen them in Holloway Road and the Underground (I think) too. It's like a throw up without using letters.   

This image is also featured briefly in Saint Etienne's Finisterre deocumentary on London (with thanks to Todd for that information). 

Bulldog graffiti Old Street

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adam neate /  arofish / banksy / dface / eine / faile / space invaders / the london police / the toasters / zef