ROUND LAKE — In terms of unusual calls, Round Lake firefighters have almost seen it all; they’ve even rescued a cat from a tree. Last Wednesday, they accomplished something new.Nine responders from the Round Lake Fire Department were called to a farm near the village preserve around 10:25 a.m. There, they found an older male horse stuck upside-down in a muddy stream. He had collapsed from the exhaustion of trying to free himself.Joseph Plewinski, public information officer and captain at the Round Lake Fire Department, said that even the experienced firefighters were initially unsure how to approach the situation.“This was…