Uga VII's readiness to take the field for the 2008 football season is a topic for school officials, Cecilia Seiler said, and none could be reached immediately Saturday morning.
Sonny Seiler, whose family has owned all the dogs, was at his office Saturday morning, his wife said, and could not be reached for comment or to add details on the dog's death.
Uga VI took the reins from Uga V early in the 1999 season. He turned 10 in July and would have been the only one of the dogs other than Uga I to serve past his 10th birthday.
The line of mascots has long garnered national attention, culminating with Uga V's appearance on the cover of Sports Illustrated, which named Uga as the nation's best mascot.