Read the following context and choose the best option to answer the question.
Context: An owner brought in a dog that was coughing like he had something caught in his throat . He would cough so hard that he gagged and spit up a white , foamy , slimy material . He ate and drank just fine but just coughed all the time . The dog 's history revealed that he was boarded a week before , and he also had received his Bordetella or " kennel cough " vaccination a month prior .
Question: How may the dog be feeling right now ?
Options: 
- Sad
 - None of the above choices .
 - Sick
 - Happy


Sick