A Ghost Story from a Certain Junior High School

Let's just say it was a certain junior high school in the Kansai region. There's a ghost story that's been passed down through generations, even before the era when shows like 'Sekai no Mieru Basho' (Places Where You Can See the World) were popular. I'm not sure if it was the principal's office or where exactly, but apparently, there was a creepy painting of a dog displayed there. It was said that in the middle of the night, the dog would come out of the painting and roam the school grounds, dripping blood... I didn't go to that school, and I haven't seen it with my own eyes, but it was rumored to be a truly disturbing painting. I can't find anything about it online, maybe it's faded away and disappeared since it's such an old rumor. There were also other incidents at that school, like when a Kokkuri-san session became a big deal, and I've heard other personal accounts, but perhaps another time...