Fang (dog)
From Tolkien Gateway
Fang was one of the guard dogs of Farmer Maggot's Bamfurlong. Fang was one of the three large, wolf-like dogs, (the other two were named 'Grip' and 'Wolf').
These ferocious but well-trained animals lived at his farm at the time of the War of the Ring, but he had evidently kept other dogs before these. Frodo had frightening memories of Maggot's dogs going back some thirty years, but the dogs that had threatened him three decades earlier could hardly have been Fang, Grip or Wolf.[1]
Etymology
Fang means "canine tooth" but was also an archaic English verb meaning "grip".[2]