Mosquitoes can transmit pathogens to pets and animals. The three mosquito-borne diseases found in our district, West Nile, St. Louis encephalitis, and Western equine encephalitis viruses, primarily circulate in birds. West Nile Virus and Western equine encephalitis virus can be transmitted to horses. However, there is a West Nile and Western equine encephalitis virus vaccine available for horses. Additionally, dogs can also be infected with dog heartworm, a mosquito-borne parasite.