tracker dog
noun [ C ] mainly UK uk/ˈtræk.ə ˌdɒɡ/ us/ˈtræk.ɚ ˌdɑːɡ/
警犬
a dog specially trained to help the police find people they are looking for, using its sense of smell
The body was found after an extensive search by police with tracker dogs. 警方在动用警犬进行了大规模的搜索后找到了尸体。
Compare: sniffer dog