<title>Abstract</title> The objective of this study was to evaluate the applicability of ARFI elastography in 36 prospective cases in differentiating parenchymal lung abnormalities in dogs: consolidations, atelectasis and neoplasms, the latter being subdivided into nodules and masses; and correlates the data obtained by the technique with B-mode ultrasound parameters, cytology results, histopathology and information from the analysis of pleural effusions when present, in addition to clinical data, indicating cut-off values in dogs. Characteristics of lung lesions were evaluated using radiography as a screening test to locate the lesions and B-mode ultrasound. Subsequently, elastographic characteristics (qualitative and quantitative) were evaluated. B-mode ultrasound assessments and qualitative elastography were not statistically demonstrated in the parameters studied to differentiate between malignant and benign lesions (p > 0.05); while in the quantitative elastographic evaluation, less atelectatic lesions (1.48 m/s) were affected when compared to nodules (2.84 m/s), consolidations (2.94 m/s) and masses (3.12 m/s), in ascending order of complaint, demonstrating statistical significance (p = 0.023), even though a diagnostic cut-off value was not obtained. It is concluded that ARFI can contribute to the differentiation of lung lesions, complementing clinical data in the evaluation of dogs.
