My dog comforting another dog who just lost his sister

My dog, chucho (left), is a cattle dog mix who is fiercly loyal and committed to me. He doesn't care for other dogs touching him. Certainly no cuddling. My in-laws had a german Shepard, chica, and this tiny curly dog, mellow. Chica passed away on Saturday and mellow is definitely confused, lonely and felling anxiety about being left alone. Last night, completely unprovoked, chucho let mellow cuddle up to him. I chalked it up to him being tired after playing in the yard. Lo and behold, chucho lifts his head to assess the situation. Surely he was about to get annoyed and move. To my complete surprise, he was more than Okay with this and rested his head on mellow. It may never happen again. But I'll truly feel he was comforting his cousin in a hard time.