What is the closest relative to a boxer?

The closest relative to a Boxer is the Bullmastiff, as both breeds share a common ancestry that traces back to the Molosser family of dogs. Additionally, Boxers are closely related to breeds like the German Pinscher and the Rottweiler, which also have similar physical characteristics and traits. These relationships highlight the Boxer’s lineage as a working breed developed for strength and agility.