Yazbek KVB, Fantoni DT. Evaluation of tramadol, an "atypical" opioid analgesic in the control of immediate postoperative pain in dogs submitted to orthopedic surgical procedures. Braz. J. Vet. Res. Anim. Sci. 2005;42(4):250-258. doi:10.11606/issn.1678-4456.bjvras.2005.26418