After Theon has taken Winterfell, Shaggydog flees with Osha, Bran, Rickon, Hodor and Summer. Shaggydog and Summer reunite with the fugitives, who had then hidden inside the crypts of Winterfell, after the castle is sacked and put to the torch.
In the A Song of Ice and Fire novels, Shaggydog is the fiercest and least-disciplined of the five wolves, reflecting Rickon's willful nature. Bran thinks the wolf's name is stupid, and "Shaggy" soon becomes a preferred name. He is described as black, with bright green eyes.