Theory:

     The new goat was very pretty. She was white as snow, and had two little horns on her little head, and a pair of gleaming red eyes. She had a friendly temperament, and would listen to Abbu Khan’s tales with a lot of interest and affection. Abbu Khan called her Chandni, which means ‘moonlight’. He loved Chandni and would narrate to her stories of all his friends who were dead and gone.
 
     Several years passed; Chandni was still there. Abbu Khan believed that Chandni would never leave his compound for the free and fresh air of the hills beyond. Alas! he was mistaken again.
Explanation:
 
The new goat was extremely appealing and beautiful. It was as white as snow, with two small horns on her head and a pair of dazzling red eyes. She had a pleasant, friendly temperament and listened to Abbu Khan's stories with great attention and fondness. Abbu Khan gave her the nickname Chandni, which means "moonlight." He adored Chandni and used to tell her about all of his friends (goats Abbu had before Chandni) who had died.
 
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Chandni
 
Chandni remained with Abbu for several years. It adored Abbu just as much as he adored Chandni. Chandni's nature led Abbu to assume that, unlike his previous goats, Chandni would not leave Abbu's compound and head to the hills. "Alas! he was mistaken again." This sentence in the paragraph appears to be a clue to the readers that Chandni's temperament was about to change.
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Disposition The particular type of character that a person has
2.
GleamySomething that has a shining, clean appearance
3.
TemperamentThe basic character of someone
4.
FondnessLikeness for somebody or something
5.
Adore To love and admire
Reference:
National Council of Educational Research and Training (2007). Chandni – Zakir Husain (pp. 43- 51). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.