You can now see why a dog must be treated, but how did he get heartworms in the first place? From mosquitoes.
Mosquitoes feed on the blood of the dog around the muzzle, the ears, and on the stomach where there is the least amount of hair. They infect the dog while they are feeding on the dog’s blood.
Treatments are almost as dangerous as the heartworms themselves. The chemicals that are used should be very strong to be effective.
