Sentence 1: I went to the dog park with my black lab. 
 Sentence 3: Halfway to the park, my dog had to poop 
 Sentence 4:  I forgot to bring a plastic bag to pick up the poop 
 Sentence 5:  I just left it there, and continued to the dog park 
 Option 1: My dog ate a lot before we left the house. 
 Option 2: My dog didn't ate any food.