1. dog anxious to jump over the wall means a dog can jump over the wall when it is anxious. It is a metaphor for taking extreme action without regard to any other means when one is desperate.

2, source

Tang - Wang Chongmin, Wang Qingbeans, Xiangda, Zhou Yiliang and other editors of "Dunhuang Changwen Collection - Swallow Fugue": "People are anxious to burn incense; dogs are anxious to jump over the wall."

Interpretation:

People think of burning incense and worshiping the Buddha only when they are in an emergency, and dogs can jump over the wall when they are in a hurry.

3. Example Sentences

(1) The criminals are already desperate, we must not be too hasty lest they jump over the wall in a dog's hurry.

(2) We must always be on the alert to prevent the class enemy from jumping over the wall in a hurry and making a dying struggle.