Why is my dog gagging and reverse sneezing after heartworm treatment?

This can be normal after the first round of heart worm treatment. As the adult heartworms die, they cause an inflammatory reaction in the lungs. It is VITAL to keep Charlie under strict confinement during this time. This means he needs to stay in a confined area or crate and then only to be taken outside on a least to go to the bathroom a few days per day. If they are too active the cough will only get worse. You can try to give him some Benadryl twice a day to help with the sniffles/sneezes. See link below. I would also contact your vet just to tell them what is going on to make sure they don't want to add any meds or change any meds for him. Of course, if he stops eating, the cough gets worse, you notice labored breathing, or he is coughing up blood then I would have your vet take a look at him immediately. I hope this helps! https://www.petcoach.co/canigive/dog/benadryl/#!

Reverse sneezing isn't particularly linked to vaccinations or to heartworm medication. It is simply irritation of the throat (larynx) due to possible allergies or irritation of the throat from a foreign object. I would recommend monitoring her today to see if the reverse sneezing resolves on its own within 24 hrs. As long as she isn't acting ill, eating, drinking well then its ok to monitor. If the sneezing fits don't seem to be resolving on their own, then its best to contact your vet who will likely recommend a short course of antihistamines to try next. In rare instances, a nasal mite is the underlying cause for unresolved reverse sneezing. I hope that Kona's reverse sneezing fits resolve soon! Best wishes and take care.

This cough could be due to heartworms, especially if your dog isn't up to date on his heartworm treatments, but it could also be due to cardiac disease, respiratory disease, or kennel cough. Given that he has been gagging and hacking for about a week, I would have him seen by a vet tomorrow. The vet can diagnose what is causing his symptoms, and can discuss treatment options with you.

These signs are compatible with the heartworm infection which can cause dyspnoea and respiratory signs. I would strongly advice to contact your local veterinarian as these signs might be compatible with respiratory/cardiovascular complications during heartworm treatment.

Any change in breathing warrants a trip to the vet for a recheck. While it’s possible that there’s nothing wrong, you could also be noticing the beginning of a complication of heartworm treatment. Pulmonary thromboembolism can occur when dying worms become lodged in the small blood vessels of the lungs. Your vet might want to take a chest x-ray.

What you are seeing is not typically a side effect I've ever seen in a dog receiving this treatment. It may be that Charlie is fighting an upper respiratory infection or has irritation in the sinuses. If this does not resolve on its own, I would recommend having a veterinarian examine Charlie so that the most appropriate diagnostic and treatment recommendations can be made. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.

Coughing can occur from the damage the worms are doing to the lungs. It could also be caused by the worms dying off and causing inflammation, although I'm not sure how likely that is with the slow kill method. I would recommend keeping him crated and resting (no walks, no running, no excitement -- basically no getting his heart rate up) until he can get to the vet for evaluation, which will likely include chest x-rays and a discussion of if he needs anti-inflammatory medication and cage rest to get through this treatment. Wishing you and Bug (love his name!) the best of luck.