[kdhawks]

Originally Posted by 107barney

In the 10 years I've had intranasal done to Barney and Daisy, I've never had an adverse reaction or nasal problem. Barney has reverse sneezing and even he tolerates the intranasal well.

There are less reactions to the intranasal, no pain of a shot, and it offers protection faster than the injection.

Here is an article on the topic that sums it up.
Kennel Cough (Infectious Tracheobronchitis) in Dogs

Thanks for the link.