Miranda Lambert Calls Her Animal Rescue Work with Her Mom a 'Passion': 'Good for the World' (Exclusive)

Miranda Lambert relishes stepping away from "the glamor" of her celebrity status to pursue another true "passion" — animal rescue.

The country star, 41, shared the joy her work as a co-founder of the animal rescue organization MuttNation Foundation alongside her mother, Beverly June Lambert, brings to her life at Boot Barn Presents: VOICELESS, a Broadcast Special, Fashion Show, and Red Carpet Celebrity Charity Event held in Nashville on Monday, Nov. 18.

"It's cool to be able to share passion with your mom, and she's been my biggest fan and biggest supporter," Miranda tells PEOPLE. "But [MuttNation is] something that brings us together on a human level. It's out of the glamour, out of the glitz. It's just about a passion of doing good for the world and saving animals."

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Miranda and Beverly founded the MuttNation Foundation in 2009. According to the organization's website, the nonprofit has "raised over $9 million" to promote its "mission to promote the adoption of shelter pets, advance spay and neuter; and educate the public about the benefits of these actions."

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Now, Miranda and Beverly are expanding MuttNation's efforts to another category: horse rescue. The pair recently launched the annual Idyllwind Grant, named after Miranda's first horse, through MuttNation. The foundation awarded the first grant to Lucky Break Rescue — a woman-owned and operated nonprofit organization dedicated to rescuing at-risk equines — for its continued efforts to save horses.

"I love people that are as fanatical about rescue as I am," Miranda shares. "And rescuing horses is such a different animal. I mean, honestly, pardon the pun, but it's such a big deal because these are huge animals who have been through so much trauma. And so it takes so much patience on either side, and so much trust on either side. And I think that it's just not an easy feat."

The singer-songwriter adds that she's "just a huge fan of anyone that's rescuing animals."