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Zooey Deschanel stars in the new rom-com Merv with Charlie Cox and an adorable terrier mix

She tells PEOPLE that acting with dogs is "not what you think"

The animal lover says the canines "are very serious," adding, "it's not like you're getting to snuggle them"

Animal lover Zooey Deschanel says performing with pups isn't necessarily a (dog) walk in the park.

"The dogs are very serious," says Deschanel, 45, who has a canine costar in her new romantic comedy Merv . "It's not like you're getting to snuggle them. In fact, you're not allowed to when they're working. Yeah, it's not what you think."

In Merv, Deschanel and Daredevil star Charlie Cox play exes Anna and Russ, who share custody of their titular pet. One big problem: He's depressed because his owners are

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