Hacking Cough - 5 Month Old 6-month Old Puppy Having Frequent Accidents, Slight Hacking Cough And He's Not Quite Himself.?

6-month old puppy having frequent accidents, slight hacking cough and he's not quite himself.? - hacking cough - 5 month old

My 6-month-old shepherd mix puppy with frequent accidents in his cage, which is veryy unlike him. However, he had a little water until it is as if he put in his cage, and he must go back in 4 or 5 minutes. He had a slight cough that sounds like kennel cough, so I investigated. He is also right on the edge today. Quite aggressive, high energy, but energy is more aggressive than playful as usual. I'm worried.