Bryan Johnson tackled human longevity. Now he wants dogs to live forever.

Bryan Johnson with his new dog, Katara, at a longevity event in San Francisco this week.

Ben Bergman/Business Insider Johnson recently adopted a professionally trained Belgian Malinois to protect him from attackers.

The new dog piqued his interest in extending dogs' lives.

He plans to put his dog through the rigorous data collection and interventions he does for himself.

Tech entrepreneur Bryan Johnson has become famous for his mission to help humans live forever, with his catchphrase "Don't die." Now he wants to do the same thing for dogs.

Johnson's interest in canine longevity was piqued when he recently adopted a professionally trained Belgian Malinois named Katara to protect him from attackers.

This week, at a longevity event in San Francisco, Katara was a constant presence at Johnson's side as he cheered on tech workers trying to complete as many push-ups as possible, one metric used to measure their biological age.

Later, Katara, who will turn two in October, lay patiently at Johnson's feet as he was interviewed by venture capitalist Sarah Guo.

"I get quite a few death threats, and so she is my guard dog," Johnson explained to Guo.

"We go everywhere together, and we have bonded for the past month." I got a dog.

Dog owners have about a 24% lower risk of dying early.

What should I do now? pic.twitter.com/eOqo1zZowZ — Bryan Johnson (@bryan_johnson) August 20, 2026 Johnson clarified to Business Insider that he has no plans to launch a company focused on canine health yet.

Rather, Katara will be subjected to a version of the rigorous data collection and longevity interventions that he chronicles in great detail for his millions of followers on X and Instagram.

"She's going to become the most measured dog in the world," he said in an interview.