Yes, mosquitoes do bite dogs. Their owners should take measures to prevent it from happening as an infected mosquito"s bite can cause heartworms to grow in the dog. Heartworms take 7 months to gestate and after that they can grow up to 12" long and stay in the system for up to 7 years. During that time, they can do extensive damage to the dog's health. It is best to get your veterinarian's professional advice.
Dogs may not be easy victims for mosquitoes because of their rather thick hair and they scratch at the slightest moment of irritation. But sometimes, thin-haired breeds and those that are not regularly bathed can be infested.