What is Jurgis' only complaint about the hospital?

From the text:

Jurgis spent his Christmas in this hospital, and it was the pleasantest Christmas he had had in America. Every year there were scandals and investigations in this institution, the newspapers charging that doctors were allowed to try fantastic experiments upon the patients; but Jurgis knew nothing of this—his only complaint was that they used to feed him upon tinned meat, which no man who had ever worked in Packingtown would feed to his dog.