She's lost custody of her kids, now an animal rights group wants Britney Spears to give up her pets too.

A spokesman for People for the Ethical Treatment of Animals says the group's president has written an open letter to Kevin Federline encouraging him to pursue custody of Spears' animals.

Michael McGraw says "PETA fears that the dogs may be in danger." He says PETA is particularly concerned about the welfare of her Yorkshire terrier puppy London, which she takes to nightclubs and shopping malls.

McGraw also says Spears' dogs should be with her sons as they adjust to life with Federline. He says "the companionship of beloved animals can make a world of difference for the kids during this obviously difficult time."

Click here to read the letter

Click here to see a clip of Britney's new video