Which one of the following breeds of dogs is not suitable as sniffer dogs in aviation security ?

In aviation security, sniffer dogs (K9 units) are selected based on their olfactory sensitivity, trainability, temperament, and physical stamina. German Shepherds and Labradors are the most common breeds used globally for detecting explosives and narcotics due to their high intelligence and work drive. Cocker Spaniels (and Beagles) are also frequently employed in airports because their smaller size allows them to search tight spaces, and their non-threatening appearance is ideal for working around passengers in crowded terminals. In contrast, the Pomeranian is a toy breed primarily bred for companionship. They lack the necessary physical endurance, scent-tracking drive, and specialized working traits required for the demanding and rigorous environment of aviation security. In India, agencies like the Bureau of Civil Aviation Security (BCAS) and the CISF typically induct breeds like the Belgian Malinois, German Shepherd, and Labrador.