The four young people sat in the car in Bålsta north of Stockholm while the police checked the ownership of the vehicle. Police discovered that the car had been reported stolen, according to local media reports.
Police then challenged the children who tried to drive away from the police patrol. They got as far as a road barrier and elected to continue their flight on foot.
Police let loose a tracker dog which managed to find the 11-year-old driver and a 14-year-old female accomplice. The boy was bitten by the dog as he resisted its advances but is reported to have suffered only minor injuries.
Both children were admitted to hospital to get their wounds dressed.
Uppsala police expressed surprise at the age of the joyriders.
“I have never experienced, in my 25 years anyway, such young people,” said Tommy Rinaldo at Uppsala police to news agency TT.
Police know the identities of the other two youths involved in the incident. They are reported to be 14 and 15 years of age.
The 15-year-old is thus the only member of the gang of four that is of the age of criminal responsibility although police were unable to confirm on Saturday morning whether they were suspected of any offence.
The four children had by Saturday morning been handed over to their parents.