The Cleveland Browns are dealing with a heartbreaking loss on Tuesday -- the team's live mascot, Swagger Jr., has passed away.
He was just five years old.
The team posted a touching message in the Bullmastiff's honor minutes ago ... saying, "We are sad to announce the passing of our beloved mascot, SJ. We are so grateful for his many years of loyal support and cherish all of the wonderful memories he helped create for fans young and old.