Video: Dominic Dyer Speaks Out Against Dog Meat Eating Yulin Festival
There is now growing pressure on the Chinese government to stop the festival, which has been running since 2010, from taking place this year.
One of the organiser's of the London demonstration, Dominic Dyer, told the crowd he felt "horrified", along with millions of other people around the world by the dog meat festival.
He said: "It's a horrible, horrible business, and we are here to make our voices heard."
The 2015 Yulin Dog Meat Festival slaughtered over 15,000 dogs and cats. Most of these animals were pets stolen from loving families and sold to the butchers of Yulin.
Profits from this T-Shirt sale goes directly into the efforts to ending this inhuman festival.