Kilo (prefix for a 1000) is not specific to cocaine but is commonly used to describe a quantity of illegal narcotics. A kilogram or 1000 grams is equal to 2.2 pounds. A "kilo" or brick of cocaine or meth or heroin is 2.2 lbs. "kilo" is somewhat popular name for a drug detection k9.
It meens your dog is named after measurment of weight typically used in selling or smuggling cocain.