The Formula One racer is an outspoken supporter of animal rights and environmental causes, and even his bulldog Roscoe is fully vegan.
The 36-year-old shared a snap of his pooch with a bowl of fruit on a plane, presumably in first class, or perhaps a private plane; either way, it certainly ain't the Ryanair economy many of us are used to.
Posting the photo on Roscoe's Instagram account (yes, Roscoe has an Instagram account), Hamilton captioned the picture: "I loves beings a vegans. I gets all the vegetables ands fruits I wants.
"My favs are watermelons ands pineapples. Ives lots 5kgs ands feels betters thans evers."
The post has received almost 100,000 likes, but among the comments, many people suggested that the sentiment of the whole thing was a bit hypocritical.
First of all, some argued the environmentally friendly merits of a vegan lifestyle were nullified by flying about in airplanes.
One person commented: "Talks about saving the environment whilst flying his dogs around first class/on private jets.
"If everyone had a carbon footprint as big as Lewis Hamilton we wouldn't have an Earth left."
Another said: "He's flying with a private jet and telling everybody that he would live so consistently. Excuse me?"
A third added: "Doesn't eats meat, flies on a jet."
Others questioned whether imposing a vegan diet upon Roscoe was a kind thing to do.
One person said: "Dude I don't think a dog can survive like this."
Another added: "Please tell me you aren't making your dogs eat a vegan diet."
Hamilton announced that Roscoe had gone fully vegan last year and said the hound was healthier as a result.
However, while it is difficult to refute the environmental damage caused by the meat industry, it is still not entirely clear whether it is ethical to feed your dog a vegan diet.
Daniella Dos Santos, the president of the British Veterinary Association (BVA), told BBC Future: "In the UK, under the Animal Welfare Act the owner has the obligation to feed the animal an appropriate diet.
"If your personal belief system means you don't want to eat any animal protein, that's fine, but that diet is not designed to meet the welfare standards of your pet.
"Cats are obligate carnivores, and they require certain amounts of amino acids to be healthy, and the lack of these can lead to health problems. For that reason, you wouldn't advise a vegetarian diet, let alone a vegan one.
"It is theoretically possible to feed a dog a vegetarian diet, but it's much easier to get it wrong than to get it right. You would have to do it under the supervision of a veterinary-trained nutritionist."
Featured Image Credit: Instagram/@roscoelovescoco
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