Dog Watch
One of two shortened two-hour watches traditionally scheduled from 16:00–18:00 and 18:00–20:00.
Splitting the normal four-hour period creates an odd number of watches in the day, allowing personnel in a traditional watch system to rotate rather than keeping the same hours every day. The periods are often called the first and last dog watches.
Modern merchant, naval and leisure vessels use many different watch systems, so dog watches are not universal or a regulatory requirement.









