St. George gets all the credit for slaying that dragon but let’s face it. The horse did it. The horse did all the trampling and St. George just administered the coup de grace. I have always associated St. George with Britain but it seems he also had large following in the Russian Orthodox church and has frequently been depicted in religious icons. This is a photo of a 16th Century Russian painting now in the Tretyakov Gallery in Moscow.
In real life St. George is thought to have lived in the 4th Century and died in in what is now Lod Israel. His slaying of a dragon is a story that gained great popularity in the Middle Ages. The photo below is one I took at the Worshipful Company of Armourers and Brasiers in London. This exquisite miniature is a medieval sculpture done by one of the members of the Armourers.
In my humble opinion it is clear in both of these depictions that it is the horse that is responsible for getting the better of the dragon and trampling him to death. I rest my case!