The plaintiffs say the "shelter has a duty to help, not harm, homeless dogs and cats."
The Animal Legal Defense Fund along with three people from Stockton filed the lawsuit against the City of Stockton.
The suit is not asking for money, only that the animal shelter follow the law.
The shelter is required to hold strays for at least 6 days before euthanization.
But Animal Legal Defense Fund Attorney Jenni James says the shelter's records show a different story over a one year period.
"Early euthansias are happening, 1,500 animals were euthanized before the expiration of the Stockton shelter's minimum holding period," says James.
James says 80 percent of the animals are behind locked doors where the public never sees them.
"Only about 20 percent of the animals are truly being given a meaningful chance of adoption," says James.
The City of Stockton is not commenting on the lawsuit.
Over 100 people attended Monday's City Council meeting in Stockton to oppose the city closing down two municipal golf courses.
Medi-Cal beneficiaries in San Joaquin and Stanislaus County are getting better coverage when it comes to chronic pain.
Jazz violinist Regina Carter says, considering the mood of the country and the world right now, "Accentuate the Positive" was the perfect title for her new album, a tribute to Ella Fitzgerald. Carter performs Saturday at the 2017 Brubeck Festival.
This week Stockton is playing to host to the $100,000 Men’s Challenger tournament, with some of the top up-and-coming tennis players in the world.
Stockton is mounting a major recruiting drive for its police department. The goal is to hire 50 new officers by the end of June.