Most dogs infected with heartworms do not show any signs of disease for as long as two years. (chai-online.org)
Most dogs infected with heartworms do not show any signs of disease for as long as two years, but this is entirely dependent on the severity of infection. (thedrakecenter.com)
Treatment The good news is that, in many situations, dogs infected with heartworm disease can be successfully treated. (pethealthnetwork.com)