I agree that it DOES sound like reverse sneezing - however, I would definitely take the pup to the vet to rule out Kennel Cough! I've never seen reverse sneezing in a 6 week old puppy - doesn't mean it doesn't happen, but I've never seen it. I love the fact that some of my beagles rarely have the problem - nor do their offspring. When I got my first beagle, she scared the daylights out of me when she had "episodes". After having so many beagles in and out of my home, I pretty much take them in stride and don't make a fuss.
Here is some information on "Reverse Sneezing".
REVERSE SNEEZE SYNDROME
General Information
Reverse sneeze syndrome is characterized by a series of rapid, loud, forced inhalations through the nostrils, lasting anywhere from 10 seconds to 2 minutes. Attacks occur on a sporadic, unpredictable basis.
Dogs usually have the head extended forward and stand still during the episode. Affected dogs appear completely normal before and after the attack. There is no loss of consciousness or collapse, though sometimes the appearance of the dog is upsetting to owners. Many dogs have these attacks throughout their lives.
The exact cause of reverse sneezing is unknown, but it may be associated with sinusitis and other respiratory disorders.
Many believe affected dogs are consciously removing mucus form the nasal passages. In fact, many dogs swallow at the end of the attack. Whatever the cause, the condition is usually not serious.
If the condition appears suddenly in an older dog or if episodes become more severe or frequent, the nasal passages and throat should be examined.
Important points in treatment:
Treatment is not necessary when the episodes occur infrequently on a random basis.
Home treatments that have been reported to be successful include massaging the throat, blowing in the nose, rapidly and lightly compressing the chest.
Sometimes antihistamines will help with frequency or severity of the attacks. You may give your pet _____mg of Benadryl ______ times daily as needed for this. The Benadryl may make your pet sleepy or, rarely, excitable.
Notify the Doctor if any of the following occur:
The severity or frequency of your pet’s attacks changes.
Your pet develops a nasal discharge or a cough.
Your pet’s general health changes.