Mayor Antonio Villaraigosa on Tuesday signed one of the nation's toughest laws on pet sterilization, requiring most dogs and cats to be spayed or neutered by the time they are 4 months old.

The ordinance is aimed at reducing and eventually eliminating the thousands of euthanizations conducted in Los Angeles' animal shelters every year.

"We will, sooner rather than later, become a no-kill city and this is the greatest step in that direction," Councilman Tony Cardenas said as he held a kitten at a City Hall news conference.

Councilman Richard Alarcon, who like Cardenas is a co-author of the bill, brought his two pet Chihuahuas to the event to be neutered in a van operated by the city.

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