A New York artist briefly added a papier-mache dog to the Fearless Girl statue which was planted at Wall Street, reviving the controversy surrounding the artwork.
The statue of a defiant girl was placed in front of the Charging Bull statue on the eve of International Women's Day in March this year.
It was commissioned by State Street Corporation to draw attention to the lack of corporate gender diversity.
Alex Gardega, who decried Fearless Girl as "corporate nonsense", created a little pissing pug statue to pee on her left leg.
The dog was placed there for three hours before Gardega removed it, but it was enough for people to notice and for the debate to re-ignite on social media.
He told The New York Post that the Fearless Girl statue was a "publicity stunt" by the Boston-based financial firm.
"It has nothing to do with feminism, and it is disrespect to the artist that made the bull," he said. "That bull had integrity."
He added that he deliberately made his dog statue "crappy" to "downgrade" Fearless Girl, just as that work, created by Kristen Visbal, had downgraded Charging Bull.
Some found his work mysogynistic and comments on social media have been vicious.
One woman kicked the dog statue as she walked by, commenting: "You call this art?", New York Post said.
Charging Bull was placed on Wall Street by sculptor Arturo Di Modica in 1988 as guerilla art and became a permanent fixture.
It lauded the "strength and power of the American people" in response to the market crash in 1987.
Di Modica has said that Fearless Girl changed meaning and context of his work, transforming it into a "negative force and a threat".
He is suing State Street Global Advisors, who installed the rival artwork, for trademark and copyright infringement, BBC said.
He refused to comment on Gardega's Pissing Pug, New York Post said.
Originally meant to stay for month, Fearless Girl is to stay until at least February 2018.