The Ultimate Fighter 19 contestant was relaxing on a beach in Doonbeg, Ireland when he saw that an injured baby dolphin had washed ashore.
"There was a man in the water trying to help the dolphin and I went in to help," Pendred told Fox Sports. "The man told me he had been there for a while trying to push him back out but the dolphin kept getting washed back in. The man said he was now exhausted so I told him I would take over trying to help."
"I continued trying to push the dolphin out past the waves but he continued to get washed back in," Pendred said of the rough current. "He was bleeding and had a lot of cuts so I think it was due to these injuries that he wasn't strong enough to swim past the break."
The mixed martial arts fight said he finally managed to help the dolphin to a deeper part of the water and also happened to get a Twitter photo of the incident.
"I just spent an hour in the sea at Doonbeg trying to save a baby dolphin. He was very hurt but alive and well now!" he wrote.
I just spent an hour in the sea at Doonbeg trying to save a baby dolphin. He was very hurt but alive and well now! pic.twitter.com/LlteQKznHj— Cathal Pendred (@PendredMMA) April 27, 2014
"Sad news: The Irish Whale & Dolphin Group have said that the young dolphin washed up in Doonbeg again last night," Pendred wrote. "I tried my best."