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Abstract
This work was conducted on 75 mongrel dogs varied in weight from (2-20 kgm.) and both sexes (33 males and 42 females). These animals were divided to apply 4 experiments. The first experiment consisted of 15 dogs. Each of the 2nd, 3rd and 4th experiment included 20 animals. In each experiment, the animals were divided into 5 equal groups. This study was carried out at the Surgery department, Faculty of Veterinary Medicine, Zagazig University.
In experiment (1), positive contrast epidurography was conducted by five doses of contrast medium (Urografin), 1ml/2kgm. B.W. (group 1), 1ml/3kgm. B.W. (group 2), 1ml/4kgm. B.W. (group 3), 1ml/5kgm. B.W. (group 4) and 1ml/6kgm. B.W. (group 5).
In experiment (2), epidural analgesia was conducted by five different doses of lidocaine hydrochloride 2%, 1ml/2kgm. B.W. (group 1), 1ml/3kgm. B.W. (group 2), 1ml/4kgm. B.W. (group 3), 1ml/5kgm. B.W. (group 4) and 1ml/6kgm. B.W. (group 5). In experiment (3), epidural analgesia was conducted by 0.2mg/kgm. B.W. xylazine completed by saline to five different volumes, 1ml/2kgm. B.W. (group 1), 1ml/3kgm. B.W. (group 2), 1ml/4kgm. B.W. (group 3), 1ml/5kgm. B.W. (group 4) and 1ml/6kgm. B.W. (group 5). In experiment (4), epidural analgesia was conducted by 0.2mg/kgm. B.W. xylazine combined with five different doses of lidocaine hydrochloride 2%, 1ml/2kgm. B.W. (group 1), 1ml/3kgm. B.W. (group 2), 1ml/4kgm. B.W. (group 3), 1ml/5kgm.