This study was carried out to evaluate the effects of doxapram after medetomidine treatment. Twenty dogs were sedated with medetomidine(0.04mg/kg IM) Ten dogs were injected doxapram(2mg/kg IV) as a experimental group and ten dogs were injected with saline(5$mell$ IV) as a control group in twenty minutes after the injection of medetomidine. Recovery time, heart rate, respiratory rate, body temperature. blood chemistry, electrocardiogram findings (ECG) were recorded. The results obtained were as follows ; 1. Medetomidine revealed fast and excellent sedative effect. 2. Recovery time was shorted by doxapram(p<0.01) 3. Respiratory rates were decreased significantly by medetommidine, but increased remarkably after the injection of doxapram and them decreased gradually and revealed normal levels(p<0.01). 4. Herts rates were decreased significantly by medetomidine but increased remarkably after the injection of doxapram and then decreased gradually and revealed normal levels(p<0.01). 5. Body temperature were increased slightly and then decreased by medetomldine and in experimental group revealed with higher levels than those of control group(p<0.01) 6. Arrhythmias were observed after the injection of medetomidine, but relieved after the injection of doxapram . There was no another change on electrocardiograms.