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These celebs fell hard for their furry movie-star friends — and adopted them.

Working with animals can be ruff, but these four-legged actors were simply the cat’s meow on set, so their human counterparts made them costars forever by adopting them!

Viggo Mortensen and Uraeus, Etc.

Viggo doesn’t horse around: He adopted his Lord of the Rings steeds Uraeus and Kenny hot on the hoofs, er, heels of buying the pony T.J. from Hidalgo.

Elizabeth Taylor and King Charles

While filming National Velvet, a young Elizabeth took a tumble off King Charles. But she loved the horse, so studio legend Louis B. Mayer gave the beauty to Liz on her 13th birthday!

Sophie Turner and Zunni

Sansa Stark’s pet dire wolf, Lady, met a grisly end on Game of Thrones, but Zunni, the gorgeous dog that played her, is now Sophie’s lifelong costar in Game of Homes!

Sylvster Stallone and Cuff and Link

These two turtles came out of their shells in 1976 for the Rocky star, who adopted them. They made their own comeback as themselves in the 2018 franchise follow-up, Creed II.

Sarah Jessica Parker and Lotus

The Sex and the City alum fell head over heels for her feline TV friend … And Just Like That SJP gave Lotus new digs where he can live out his nine lives with love.

Robert Redford and Let’s Merge

The human-horse friendship was so electrifying on The Electric Horseman that Robert brought the equine back to his Utah ranch.

Charles Esten and Blue

Deacon Claybourne may have given away his prized yellow lab Sue on Nashville, but Charles brought his TV K9 colleague home with a colorful new name.

Taylor Swift and Benjamin Button

A self-proclaimed cat lady, Taylor shot her “Me!” music video with this cute stray kitten — and they’ve been inseparable ever since.

Jennifer Aniston and Norman

Jen made fast Friends with Norman on her sitcom — and took him home after his animal trainer owner was going to retire the four-legged star.