When Torgeir Berge's dog, Tinni, struck up a friendship with a fox in a Norwegian forest, he saw an opportunity to educate people about the realities of the fur industry.

Berge photographed the unlikely furry friends as they wrestled and played, and with the help of his friend Berit Helberg, he’s putting together a book about Tinni the dog and Sniffer the fox.

"Sniffer and Tinni want our help to spread their message about fur and friendship, and the knowledge that the fox is only a dog of the forest with the same reactions and movements as the dogs we look at as man’s best friend," Helberg writes on her website.

The untitled book, which will be released next year, chronicles the adorable duo and aims to show readers "how similar foxes and dogs actually are."

A portion of the book’s sales will be donated to an organization that works to protect foxes and other animals that are killed for their fur.

More than 75 million animals, including foxes, rabbits, mink, bobcats, foxes and even domestic cats and dogs, are killed each year for the fur trade, according to the Humane Society of the United States.

For an up-to-date list of fur-free retailers, designers and brands, visit the HSUS website.

Below, take a look at the interspecies friendship that inspired a book.

Sniffer and Tinni

Sniffer the fox and Tinni the hound play

Sniffer the fox and Tinni the dog play in the forest

Sniffer the fox follows Tinni the dog in the snow

Sniffer the fox and Tinni the dog

Sniffer the fox and Tinni the dog wrestle

Sniffer the fox and Tinni the hound

Sniffer the fox and Tinni the dog rest after a hard day of play

Sniffer the fox and Tinni the dog play on a fallen tree

Sniffer the fox and Tinni the dog trot off into the woods

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