Trade union activists say their annual May Day march will commemorate two of the titans of their movement; the former leader of the RMT Bob Crow and the former Labour MP Tony Benn.
The London May Day Organising Committee said it wanted to pay tribute to their work but also put across the message that the movement should not just mourn but also organise to fight for rights for workers.
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The one-year-old Yorkshire Terrier was attacked and killed while being taken for a walk.
The lifeboat crew carried the pair into their boat and dropped them off back at Tower Bridge as people watched from the riverside.
The huge painting took two graffiti artists thousands of hours to complete in east London.