A dog may notice that a familiar companion is absent and can react strongly to the change in routine and social environment. Whether a dog understands death as a permanent concept is not something research has established.
What this means
A dog may notice that a familiar companion is absent and can react strongly to the change in routine and social environment. Whether a dog understands death as a permanent concept is not something research has established.
Dogs learn from patterns, consequences, body language, scent, voice, and repeated experience. The best interpretation depends on what happened immediately before and after the behavior, along with the individual dog’s history.
Watch the whole dog
One behavior rarely has only one meaning. Look at posture, ears, eyes, movement, vocalizing, environment, and recent changes before drawing a conclusion.
Evidence & sources
Last reviewed: September 19, 2026