Ferrari's Lewis Hamilton has pulled out of a Formula One tyre test with Pirelli to be with his ailing bulldog Roscoe, who is in a coma.

Ferrari confirmed the seven-times Formula One world champion was not taking part in the test on Friday at Italy's Mugello track, with Chinese reserve Zhou Guanyu taking the Briton's place.

Hamilton also provided an update on Roscoe's health on Instagram.

"Roscoe caught pneumonia again and was struggling to breathe," he wrote. "He was admitted to hospital and sedated to calm him while they did checks on him and during the process his heart stopped.

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