More: Lindi and Lily are best friends, as are the owners of the two dogs. Lily "taught " Lindi to swim by leading her into the water for the first time. The dogs carry a stick together on walks and play fight vigorously. Lindi whimpers with excitement as we drive up to Lily's house. But Lily's sudden death 3 days ago has brought this to an end. How do you help a dog grieve?