In Siberia a Russian team has been working on domesticating foxes for 60 years now. It all started in 1959, when geneticist Dmitri Belyaev started selectively breeding foxes that he pick up on fur farms. The foxes that showed the most affinity towards humans would breed the next generation, and then the foxes from that generation that showed the most affinity towards humans would breed the next generation, etc.
After Belyaev's death in 1985, geneticist Lyudmila Trut took over. Over time, the foxes developed more dog-like traits; Their ears stayed floppy for longer while they were pups, the first piebald foxes emerged, and they started showing a dog-level affinity towards humans.
Some of these foxes have become pets for people here in the united states. In the hills just outside of San Diego, California, at the Judith A Bassett Canid Education and Conservation Center, you can meet some of these foxes.
To learn more, visit: https://www.theverge.com/2018/9/11/17842410/pet-tame-foxes-domestication-dogs-genetics