Sentence 1: Damian's new dog kept messing on the carpet. 
 Sentence 3: Damian bought a dog crate to help potty train the dog 
 Sentence 4:  He locked her in it when he wasn't around to prevent accidents 
 Sentence 5:  After a month, Damian was able to effectively potty train his dog 
 Option 1: He was worried that the landlord would get angry about the damage. 
 Option 2: His landlord made him get rid of the dog.