英文關鍵字
animal
animals
background
canine
criminal
demonstration
department
detection
divided
dog
drug
enforcement
exhibition
forces
german
guard
guarding
italian
job
law
leash
liberty
love
man
meeting
military
narcotic
obedience
officer
person
pet
police
policeman
safe
searching
security
service
shepherd
sniffing
special
staff
terrorism
tracking
trained
trainer
training
uniform
violence
working