英文關鍵字
dog
handler
trainer
canine
command
exercise
police
security
work
defense
demonstration
guard
guarddog
man
protect
protection
protective
soldier
teach
testing
training
trained
animal
obedient
pedigree
pet
purebred
apprehend
base
bite
black
chase
combat
criminal
detention
grass
hound
jumping
military
perpetrator
policemen
show
skill
team
follow