An Upstate animal control agency announced Wednesday it is celebrating the newly found forever home for the largest “dog” to ever enter its shelter.County officials, rescuers, and volunteers will bid farewell to “Mack” at 3 p.m. Thursday at the shelter.Mack is really a 2-year-old, 1,000 pound Jersey Bull, who only thinks he’s a dog, and just like the other shelter residents at Oconee County Animal