How long can heartworms go untreated?
Christopher Ramos
Updated on April 23, 2026
Once inside a new host, it takes approximately 6 months for the larvae to develop into sexually mature adult heartworms. Once mature, heartworms can live for 5 to 7 years in dogs and up to 2 or 3 years in cats.
What happens if heartworm is left untreated?
Not all dogs with heartworm disease develop into stage 4. But if it is left untreated, heartworm disease will progress and damage the dog's heart, lungs, liver, and kidneys, eventually causing death.How long can a dog with heartworms live?
The severity of the infection, as well as the overall health of the dog, will play a role in determining how long the dog will live. In general, however, it is thought that most dogs with heartworm infection will not live more than two years if they do not receive some treatment.Can a dog live a long life after heartworms?
Dogs with heartworm disease can live high-quality lives as long as they are given appropriate care. After completing treatment and following your veterinarian's recommenda- tions on heartworm disease testing and prevention, the chances of any long-term effects are very low.How long does it take heartworms to progress?
In the newly infected dog, it takes about 6 to 7 months for the infective larvae to mature into adult heartworms. The adult heartworms mate and the females release their offspring into the dog's bloodstream, completing the lifecycle.Why Don't Humans Get Heartworm? (Spoiler: We Do)
How long can a dog have heartworms before showing symptoms?
By the time heartworm symptoms appear, it often means the disease has spread. Heartworm signs in dogs tend to show up when the worm reaches maturity, typically around 6 months post-implantation. This preventable condition starts when a mosquito bites an animal that's already infected with heartworm.How can you tell if a dog is dying from heartworms?
Pay attention to these warning signs of heartworms in dogs, and take your pet to the vet if these symptoms persist.
- A dry unproductive cough. ...
- Inactivity or laziness. ...
- Weight loss and loss of appetite. ...
- Shallow and rapid breathing. ...
- Distended chest. ...
- Allergic reactions. ...
- Collapsing or fainting.