how long does it take for heartworm symptoms
Symptoms of a heartworm infection can take months to appear. Here are some of the common signs that a dog has heartworms. Symptoms of heartworm disease may take more than 6 months to appear. Heartworm disease in dogs is a silent killer that is often overlooked until itâs too late. This preventable condition starts with a mosquito bite and ends with either a long, expensive treatment or death. Symptoms may not appear until the worm reaches maturity (usually after around 6 months).