Veterinarians are sounding the alarm as they see a growing number of coughing dogs.

Wendy Brown’s three golden retrievers — Bridge, Dooley and Lulu — are among the dogs who started showing symptoms earlier this November.

“Dooley started doing kind of this huffing and also seemed to feel quite lethargic,” Brown recalled to “Good Morning America.” “Not too long after, Bridge began to exhibit the symptoms. But his were louder, more boisterous. I thought it was his stomach because he made like a retching sound.”

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Initially, Brown thought her pets had a typical kennel cough but when their symptoms didn’t subside, she knew it was something more serious.

“The vet started him on a 10-day cycle of doxycycline. Today was day 10 and he is not a lot better,” Brown said.

Continue here: GMA