Berto said about 2 years ago he had bloated and twisted. The twist had caused the spleen to fold in half. Berto did not know that until he took him in a while after the surgery with a high fever and throwing up. The ER Xray showed the spleen folded in half and the said that was the cause of him getting sick. Berto told them at his age and i agree, that the surgery would have been to much for him. A while passed by and he had another episode, they treated it with antibiotics and he was fine. Tonka looked old to me when Berto visited a few months ago, i knew it would not be long and Tonka would say goodbye to his wonderful devoted master. Another episode with the high fever and throwing up and Berto said Tonka just looked to tired. So it was time to say goodbye to a wonderful noble companion.