image quality and side effects were evaluated retrospectively In a series of 183 myelographic studies performed with two non‐ionic contrast media (iohexoi and iopamidoi) at different concentrations. Side effects during and following the procedure were recorded. image quallty was assessed uslng an arbitrary scoring system and statistical analysis was performed with the cross‐tabulation test (4 times 2 table) by comparing two groups receiving contrast medium at higher and lower concentrations. No slgnlflcant differences On side effects were observed between the two groups but the ratings for image quality were significantly higher in the group receiving contrast medlum at the higher concentration than in the group recelvlng the lower concentration. The results suggest that a high concentration of non‐ionic contrast media can safely be used In dogs and may improve image quality.