In the early stages of the disease, many dogs show few symptoms or no symptoms at all. The longer the infection persists, the more likely symptoms will develop. Active dogs, dogs heavily infected with heartworms, or those with other health problems often show pronounced clinical signs.
How long can a dog have heartworms before showing symptoms?
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 would you know if your dog has heartworms?
5 Signs Your Dog May Have Heartworm Disease1Mild Persistent Cough. A persistent, dry cough is a common sign seen in dogs with heartworm disease. ... 2Lethargy. Lethargy and reluctance to exercise are also common signs described in dogs with heartworm disease. ... 3Weight Loss. ... 4Swollen Belly. ... 5Difficulty Breathing.Signs your Dog may have Heartworms | Heartgard®
Can heartworms be asymptomatic?
Clinical Signs and Stages. Class 1 heartworm positive animals have a positive antigen test but are generally asymptomatic. They cough rarely and may show slight exercise intolerance. They may have very mild changes evident on thoracic radiographs.
How long can heartworms go undetected?
Dogs are typically heartworm tested prior to transport, but due to the life cycle of the heartworm, there is a window where dogs may test negative but still have heartworms. Heartworm in these dogs may go undetected for several months or more, allowing them to serve as a source of infection for other dogs.
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