Before, I was a pet dog. When I was 2months old, a policeman ▲ (w, s, a) me. He thought I was clever and could be a police dog. Then, I started my training. Every day I learned to listen to orders(命令),fought(搏斗),got over obstacles(障碍)and used my nose to find drugs(毒品)and bombs(炸弹). Now, I'm a great police dog! Because of my short legs, I can sneak(偷偷进入)under cars or get into small places easily. Bigger dogs can't do this but I can!
Becoming a police dog is not easy. We must take lots of classes. After three to six months of training, we will take an important exam. If we pass it, we can become police dogs.
Do you know some dog breeds (品种) can't become police dogs? Here are the reasons: Golden Retriever(金毛)is too friendly. Siberian Husky(哈士奇)is too playful.Border Collie(边牧)is too ▲ (a, t, m, s, r) and sometimes it doesn't listen to orders.