A vigil will be held for two dogs killed by the Metropolitan Police in Poplar earlier this month, after more than one million people signed a petition demanding action.
Campaigners have united on the Change.org appeal, arguing the killing of Louie Turnbull's pets was "barbaric".
Sadie Geoghegan-Dann, who started the petition, wrote online: "In a statement, the Met Police claim the 'aggressive behaviour of two dogs was of considerable concern and posed a significant threat to them'.
