reports that one of the cyclists saw the dog and gave her some food. The dog, who has been nicknamed "Xiao Sa", decided to stay with the cycle race.
Xiao Sa stayed with the race for 20 days and covered up to 60km a day. She also apparently climbed 10 mountains higher than 4,000 meters during her run.
In the video
, a young man called Zhang Heng, 22, who is a student in Wuhan, Hubei Province, talks about the dog.
"She was lying, tired, on the street around Yajiang, Sichuan province," he said. "So we fed her, and then she followed our team."
Apparently the cyclists initially thought that she was following them for fun, but then she stuck with them, day and night.
"We felt she might want to come along with us, so we decided to bring her along to the end."
Zhang and his friends started a blog about the dog's adventures and Xiao Sa now has around 40,000 fans.
"We thought the dog was encouraging us, and wanted others to know its story," Zhang said.
Wang Zi, another cyclist said, "She may be the first dog who ran to Lhasa along this route."
"I have a special feeling about her, especially when I found she was never lost, waited for us at milestones on the road, and ran all the time, making me feel that she never feels tired," he said.
The nickname is a combination of "xiao" meaning little and the last syllable of Lhasa, where they ended their race.
Zhang said, "I would like to take the dog home and take care of her. She has been a stray on the road for a long time. She needs a home."