Noun:

1. a dog trained to guard property

Guardi瓜尔迪guardv.看守；守卫；保卫；提防n.警戒；哨兵；防护装置；警卫；【体】后卫guard dogs primed for attack.看门狗准备攻击Guard against a hidden arrow.谨防暗箭。guards against the misoperation防误操作guard board for water-cooling水冷护板Guards Motorized Rifle Division国民警卫队摩托化步兵师guards must be good blockers.前卫必须是一个很好的清道夫。guard against theft annunciator防盗报警器guard against theft and alarming防盗报警Guard against the competitors.看守好竞争对手；guarded heat flow metertechnique保护热流计

1. She had to defend herself against the guard dog.
   她不得不防备看门狗咬她。
2. Training a dog to be a watchdog often produces unexpected results.
   把狗训练成看门狗常常会产生意外的结果。