Zo was adopted a year ago by the 49ers' director of player engagement, Austin Moss, and she's been an integral part of the team ever since. "The players rely on Zo to brighten their day," said a spokesperson for the team. "Meetings, practice, and workouts can make for a long day. Zo acts as a stress reliever."

Zo is registered as an emotional support dog : players spend time with her in between practices and before and after games, and her presence has reportedly had a positive, relaxing effect on the entire team. She's so good at her job, in fact, that she's well on her way to becoming a certified therapy dog. Now that's a respectable work ethic.

The idea of bringing in an emotional support dog first came up while an employee was dogsitting, and the entire team felt happier and more relaxed with the pupper around. Linebacker Solomon Thomas immediately started campaigning for a resident team dog.

"I knew that [Thomas] had just gone through a really tragic experience with losing his sister, so it was just really cool to see him get as much joy as he did coming into the office," Moss told CNN . "And I knew that it was having a good impact, having a dog here."

A year later, the 49ers are currently one of only two undefeated teams in the NFL this season. Zo's impact, everybody.