Golden Retriever Wally of YouTube's @WallyMeetsWorld was surprised by his grandmother's unexpected visit after a routine appointment. The dog's sense of smell is more acute than human's, allowing them to detect subtle cues indicating that grandma is a special person associated with the pack at home. Dog behaviorist suggested that dogs would recognize new owners as being associated with their new family but not necessarily as their owner's son. The bond between Wally and his grandma formed during this visit.