Fig. 1

Canine heartworm Dirofilaria immitis in Australian dogs. Heartworm prevention compliance for 39 dogs was reported as ‘rigorous’ compliance if client indicated year round administration with appropriate product (no actual evidence of purchase and administration was provided), ‘inconsistent’ compliance if heartworm preventions were missed or intermittently administrated or incorrect monthly dose administered, and ‘unknown’ if such information was not available or was unknown. The active in prevention of dog heartworm is colour indicated (a). The age of dogs is colour indicated (b)