The Chinese word **警犬** (jǐngquǎn), meaning "police dog," is a compound noun formed through semantic combination, where the first character **警** (jǐng), meaning "police" or "to alert," acts as a modifier for the second character **犬** (quǎn), meaning "dog." This structure follows the common Chinese grammatical pattern of **modifier + head noun**, precisely indicating the type of dog—one used for police or guard duties. It is an efficient and logical form of word formation, creating a specific meaning from two independent, meaningful morphemes, similar to how "firetruck" or "guide dog" (导盲犬, dǎomángquǎn) are constructed in English.