According to local reports, only two other people joined in the bizarre protest, including this woman:
Now with Olivier de Sagazan pic.twitter.com/MtAebNBvMi— kubra khademi (@kubrakhademi1) April 29, 2017
I bark also with Olivier pic.twitter.com/Dogr6ruT94— kubra khademi (@kubrakhademi1) April 29, 2017
Not too many people are impressed, however, with his far-out approach:
"Sounds totally silly and probably ineffective," writes Kate Rhodes Burrows on Facebook. "He would have made me decide to vote for her if I were in France and on the edge."
"Is this what is meant by the expression barking mad," asks Doreen Henderson.
But some are trying to look at the bigger picture:
"Maybe a bit unhinged but undoubtedly sincere," writes Patrick J O'Donnell on Twitter.
"He wants his voice to be heard. Loudly...Why quietly protest your concerns, when you can bark it," tweets one person.
By the way, this isn't the first time the artist has chosen this particular method of protest. He previously barked outside a polling station during the French municipal elections in 2014. No word how effective his protests have been though.
France heads to the polls on May 7 to pick their new president.
39-year-old Emmanuel Macron took 23.75% of votes in the first round of polling on 23 April, slightly ahead of Ms Le Pen's 21.53%.
Analysts say it is unlikely she will win the second round of voting.