It's here…unfortunately, we just got our first POSITIVE heartworm case of the season at Emerald Animal Hospital. Heartworm is a serious disease spread by mosquitoes. The TREATMENT is expensive, painful, and occasionally has severe side effects. The PREVENTION of heartworm infection is safe and easy! In the month of March, we are offering an additional SAVINGS of $6 off the cost of 6 months of heartworm prevention or $12 off 12 doses.