The celebration in the southwestern town of Yulin has long drawn international criticism but this year authorities have prohibited sales of butchered canines, the Humane Society International (HSI) said.
Officials also plan to fine vendors up to 100,000 yuan (USD 14,500) for selling dog meat during the summer solstice event, HSI China policy expert Peter Li said in a statement yesterday.
Thousands of dogs are traditionally killed during the festival in conditions activists describe as brutal, with dogs beaten and boiled alive in the belief that the more terrified they are, the tastier the meat.
"Our restaurant is open as usual. We haven't heard of a dog meat ban," an employee of the Longmen restaurant said.
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An employee at Feilao restaurant said: "We don't know about the ban. We are open every day."
Even a city government official claimed to be unaware of the prohibition.
But HSI said it had confirmed the ban with sellers at the city's main dog meat market.
A Chinese animal rights activist, who asked not to be named, said she had also been told that sales of canine flesh would be outlawed during the event.
Dogs are eaten year round in Yulin, as in many parts of southern China.