Sleeping pills

I don't think that Indigo understood fully the sentence "可是即使好不容易捉到一只", but it's not too bad.

颜容憔悴的病人对医生说：“我家窗外的野狗整夜吠个不休，我简直要疯了！”医生给他开了安眠药。一星期后，病人又来了，看上去样子比上次更疲惫。医生问：“安眠药无效吗？”病人无精打采道：“我每晚去追那些狗，可是即使好不容易捉到一只，它怎么也不肯吃安眠药。”

A guant-eyed patient walked up to the doctor and said, "The wild dog outside my window never ceases its yapping,i'm going crazy!"The doctor gave the patient a prescription.A week later,the patient came back,and he looked ten times more tired than last time."The sleeping potion didn't work?" the doctor inquired.The patient replied tiredly, "Every night I chase (to catch) those dogs, but it's very hard to catch any of them, they just absolutely refuse to eat the sleep potion."

The second time looked better

A guant-eyed patient walked up to the doctor and said, "The wild dog outside my window never ceases its yapping, i'm going crazy!" The doctor gave the patient a prescription.
A week later, the patient came back, and he looked ten times more tired than last time.
"The sleeping potion didn't work?" the doctor inquired. The patient replied tiredly, "Every night I try to catch those dogs, but even if I catch one of them, no matter what I do, it'll refuse to eat the sleep potion."