Lewis Hamilton has confirmed that his beloved vegan dog Roscoe has been put down – saying he has 'lost his best friend'. In an effort to improve his dog's quality of life, Hamilton put him on a strict vegan diet in 2020. But is it really safe to put your dog on a vegan diet? Is it really safe to put your dog on a vegan diet? Speaking to the Daily Mail, Paul Manktelow, Chief Vet at national pet charity Blue Cross, explained that the principle of all pet diets is the same.