A card survey was sent to 340 veterinarians in the Urban, Delta, Highl
and and Coastal Plain regions of Arkansas. Veterinarians were asked to
indicate numbers of dogs tested, confirmed Dirofilaria immitis positi
ve, diagnostic techniques, frequency and period tested. A significantl
y greater percentage of dogs tested D. immitis positive in the Delta r
egion as compared with the Urban region. There were no significant dif
ferences in the percentage of treated dogs on prophylaxis or the types
of diagnostic tests among regions.