Sir Lewis posted on Instagram to reveal he had made the “hardest decision of my life” to put the 12-year-old to sleep. Sir Lewis Hamilton announces the death of dog, RoscoeWriting on Instagram, the F1 star said: "After four days on life support, fighting with every bit of strength he had, I had to make the hardest decision of my life and say goodbye to Roscoe. Bringing Roscoe into my life was the best decision I ever made, and I will forever cherish the memories we created together. "Thank you all for the love and support you’ve shown Roscoe over the years. Hamilton, who has seven world championship titles with McLaren and Mercedes, is set to be back in his Ferrari at this weekend’s Singapore Grand Prix.