Mad guard dogs slavered at the end of their chains.
看门的疯狗在锁链的一头垂涎欲滴
《柯林斯英汉双解大词典》
2
6the night before Herod was to bring him to trial, Peter was sleeping between two soldiers, bound with two chains, and sentries stood guard at the entrance.
希律将要提他出来的前一夜，彼得被两条铁链锁着，睡在两个兵丁当中。看守的人也在门外看守。
3
Maybe this is why people have chains and peep-holes on their doors, and sometimes a locked turnstile and an armed security guard downstairs.