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.
Can dogs have heartworm without symptoms?
Heartworm disease in dogs is known as a silent killer, because it can take months before your dog shows symptoms. In the early stages of infection, most dogs show little to no symptoms at all, and the more the disease progresses, the more likely apparent symptoms will develop.
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 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.
What are the first signs of heartworms in dogs?
A persistent, dry cough is a common sign seen in dogs with heartworm disease. The cough caused by heartworm disease can be one of the first signs you notice in an otherwise healthy-appearing dog. Lethargy and reluctance to exercise are also common signs described in dogs with heartworm disease.
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