U.S. freestyle skierGus Kenworthywrote a gut-wrenching goodbye Sunday to a dog he adopted from a South Korean meat farm during the 2018 Winter Olympicsin Pyeongchang.

Beemo, Kenworthy’s jindo-husky mix, had lost her appetite, and a subsequent trip to the veterinarian revealed a heart defect, the Olympian said. The dog was put on a respirator but eventually died, he said.

“Beemo was truly the best thing that ever happened to me and I feel so fortunate for our borrowed time together,” he wrote on Instagram. “I’ve never loved anything or anyone in the way that I loved that dog and she is and will always be deeply missed. She was so smart and playful. She brought so much happiness to so many people every single day.”

Kenworthy said he and boyfriend Matthew Wilkas are “beside ourselves trying to cope with her loss.”

A post shared by gus kenworthy (@guskenworthy)on May 26, 2018 at 6:32pm PDT

Kenworthy, 26, won silver in the slopestyle at the 2014 Sochi Games in Russia but did not medal in the same event in Pyeongchang. But he is an even greater champion of animal causes.

A post shared by gus kenworthy (@guskenworthy)on Feb 23, 2018 at 8:10am PST

The 26-year-old athlete alsorescued stray puppies while he was in Sochi.

This article originally appeared on HuffPost.