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My dogs are coughing, vomiting foam, and lethargic. What's wrong?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Male | neutered | 13 years and 7 months old | 75 lbs

We just moved into a new house and has overgrown yard where they roam. Both of my 70lbs lab mix dogs have begun coughing and on occasion have vomited a thick foam then rest and repeat 2-3 times an hour. One is 4yrs and one is 13. The older showed signs first but has seemed to partially recover ( 1 episode/ hr maybe) the younger is also lethargic and sleeping more than usual.

1 Answer

Most Helpful Answer

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Answered By Dr. Massimo Orioles, DVM, Cert AVP, MRCVS

Veterinarian

Published on November 10th, 2016

Considering your description I would consider the cough as the primary sign, whereas the vomiting episodes could be secondary to intense inflammation of the trachea and potentially bronchi. This kind of cough could be due to infective causes (like kennel cough syndrome), which is usually self limiting and does not require treatment (maybe that is the case of Buddy, the older one) unless systemic signs are present. Having said that, considering that there are systemic signs of lethargy I would recommend a check up as antibiotics may be needed.

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