Paris Hilton Called Out By PETA For Not Adopting New Puppy

Paris Hilton is getting called out by PETA for getting her new dog from a breeder instead of an animal shelter or adoption service ... and PETA's not pulling punches.

A rep for the animal rights organization tells TMZ ... "Paris Hilton has apparently been living under a rock for the past decade, because a day in an animal shelter would have shown her just how many Chihuahuas already need homes, and five minutes on Petfinder would turn up thousands more, including puppies."

The outrage comes after Paris showed off her latest addition to her family of pets ... a teacup chihuahua, who Paris says is related to her late dog, Harajuku Bitch.

Paris apparently got the pooch from Foufou's Teacup Puppies Inc ... according to their website, they get puppies from breeders, and that's the issue for PETA.

The PETA rep adds ... "PETA knows that retail therapy is what Paris loves best, but we ask her to keep the shopping to baubles and bags and give an animal a chance to be 'sliving' by adopting."

It's unclear if Paris bought the dog herself or if the breeder gave her the pooch as part of a collab ... but regardless, PETA isn't happy with how Paris is promoting the biz. These dogs go for around $6k and up.

Paris' new puppy is getting a similar reaction from PETA as Pete Davidson did when he recently got a Cavapoo puppy from a pet store.

Pete later went scorched earth on PETA, leaving an expletive-laden voicemail in response.