Our Blenhiem boy, Charley (6), has done it as long as we can remember. Our Ruby girl, Megan (4), has never done it.
Among our other 4 dogs (non-cavvys) only our Pekinese mix, Mocha (11), does it. All the rest do not.
(Except our Amazon Parrot, Katy, who mimics the dogs coughing perfectly and always gets doggymom and I all cranked up we she does that cause we think we got another furbaby coughing. )
Doggydad to Charley (Blen), Megan (Ruby), Mocha (Pekinese-Shih Tzu mix), Abby (Heinz 57 mix), Hobie (Poodle mix), Bessie (Min-Poodle) Butch (mix) and Snickers at The Bridge.