Why is my dog gagging? Could it be kennel cough or something else?
I'm sorry your dog is having this issue. Kennel cough is typically a dry, almost "honking" cough that can produce a white foamy/mucus substance- they can cough so hard it causes a gag reflex. It usually starts at one time of day and then gets worse and more frequent. Do you have other dogs in your home or neighbor dogs that play with your dog? If so, are they gagging or coughing? Kennel cough is very contagious thus can spread to other dogs in close contact. If you are noticing this, I would contact your vet so they can determine if your dog needs an antibiotic.
Some other possibilities for what you are noticing are other respiratory infections, allergies and/or a reverse sneeze or there may be something stuck in your dogs throat (like a grass seed or part of a rawhide chew). Also, some dogs can simply drink too fast especially when it's very hot- this can cause some water to go down "the wrong pipe" and then a gag response.
If your dog continues to gag or, especially if the gag becomes more frequent or severe, I would take him back to your vet. Your vet can listen to your dog's lungs for sounds of infection and may want to take a chest X-ray as a next step in working this up.
I hope your dog feels better soon!
Updated on September 23rd, 2025