Some 20,000 unwanted coats will be collected, distributed and gifted to those in need.
Keiron Charles, 17, died in East Acton on Saturday afternoon, the Metropolitan Police said.
A boy is arrested after Keiron Charles was stabbed to death in what police call an "awful incident".
The collie, belonging to Rory Cellan-Jones, was one of six dogs taken when a van was stolen.
William Fernandez was being held on remand at HMP Wormwood Scrubs ahead of his trial.
