Jason Kelce's beloved dog, Winnie, has sadly passed away ... and the Kelce family is heartbroken over the loss, with his wife writing in an emotional social media post that she's "lost part of my soul."
It's unclear how the pooch passed ... but Kylie Kelce said on her Instagram page Thursday night the pup "is at peace" now.
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"When I was in high school I had a folder on my desktop labeled 'Gods gift to earth,'" Kylie said in an IG post.