Sentence 1: Erin was walking home from school one day. 
 Sentence 3: Erin took the dog home and began to feed it and wash it 
 Sentence 4:  The dog was really happy and Erin decided to keep it 
 Sentence 5:  Erin now goes to the park on weekends with his dog 
 Option 1: He found a little stray kitten who looked hungry. 
 Option 2: He found a little stray dog who looked hungry.