Step 1: Understanding the Concept:
This question is from Munshi Premchand's story 'January Night' ('Poos Ki Raat'). Jabra is the name of the main character Halku's dog.
Step 2: Detailed Explanation:
Halku and Jabra are guarding their field on a bitterly cold winter night. Jabra, as a loyal dog, is the first to sense danger.
When he hears the sound of wild animals (nilgai) entering the field to eat the crops, his natural instinct is to alert his master.
Dogs alert their masters by barking. The story describes how Jabra ran around the field, barking furiously to try and scare the animals away and wake Halku up.
Step 3: Final Answer:
Jabra started barking when he heard the noise of some animals.