Mike was taken Oct. 3 for a CT scan, which revealed the diagnosis. He has one to two months left to live, according to LSUsports.net .

MORE: A look at live animal mascots in sports

When the tumor was first discovered, Mike underwent radiation, which helped shrink the tumor and kept him comfortable. However, the cancer came back aggressively and spread to his thighs and lungs.

“We will not allow Mike to suffer,” LSU’s attending veterinarian David Baker said. “We will monitor him closely every day and will humanely euthanize him when the time comes. This is about treating Mike with dignity, compassion and respect.”