Raccoons are not naturally pack animals, they don't have a pack mentality like canines, usually if you encounter a group of raccoons it is a sow with little ones. All it takes is 1 large coon to do serious damage to a dog though not likely to kill a large dog, we coon hunt with hounds and they occassionally get in fights with the big coons and they will get bitten and cut up a little maybe have their ears torn on the ends and get a little bloody but that's about the extent of it, even a smaller coon can do this sort of damage to a young inexperienced dog but it will take a large 35+ pound coon to do real damage to a older dog.I think most severe attacks on dogs are done by a pack of raccoons rather than the lone raccoon. My old dog was nearly 100lbs and he came home with cuts head to toe, his yellow/white fur red. Raccoons make a nasty pack.