Puppies arrive from Arizona on Tuesday for the Mega Adoption Event this weekend in Philadelphia.

More than 1,000 dogs and cats will be up for grabs at a two-day event in Philadelphia that’s being billed as “the largest adoption event in the country.”

The Brandywine Valley SPCA is hosting the Mega Adoption Event from 10 a.m. to 6 p.m. Saturday and Sunday at the Greater Philadelphia Expo Center.

The adoption fee is a flat $25, according to the SPCA website. All animals will be spayed or neutered, microchipped and vaccinated, the organization says — and animals can be taken home on the day they’re adopted.

Animals will include puppies and kittens as well as senior pets, the SPCA says. Big and small dogs will be available.

Most of the animals come from the SPCA’s shelter in West Chester, shelters in New Castle and Georgetown, Delaware, and several associated shelters, according to a post on the SPCA’s Facebook page.

On Tuesday, nearly 150 small dogs were airlifted in from Arizona, where they were rescued from overcrowded shelters.

The expo center will provide “meet and greet” stations for potential adopters to interact with the animals.

Brandywine Valley SPCA has placed more than 3,000 animals into homes at three previous Mega Adoption Events. This, the organization says, is the largest event to date.

The expo center is at 100 Station Ave., Oaks. For more information, contact the Brandywine Valley SPCA at 484-302-0865.

See video of dogs arriving from Arizona for the Mega Adoption Event.