Sentence 1: Greg bought a dog. 
 Sentence 3: Greg took him home and gave him a bath 
 Sentence 4:  But as soon as he walked his dog again, the dog run in the mud 
 Sentence 5:  Greg fenced his courtyard and made sure there was no mud in it 
 Option 1: The dog loved to play in the mud and was always sloppy. 
 Option 2: His dog stayed in his apartment.