Katherine Heigl bares all for a new ad for animals

London: Katherine Heigl has posed semi-naked in a saucy new advertising campaign for pets.

The dog lover covers her breasts with a puppy in the public service announcement for website IHateBalls.com.

The ad urges pet owners to spay and neuter their furry friends, The Daily Express reported.

Heigl wears nothing but panties along with high-heeled shoes and a grin in the provocative video, joking, “Unfortunately I can’t cut the nuts off human men - yet. So I’ve dedicated my time to the neutering of dogs because that’s legal.”