To study effective dossage and administration route for scaling, ketamine HCl/propionyl promazine HCl(ketamine) combination and tiletamine HCl/zolazepam HCl(zoletil) were administered in one hundred six dogs. The dogs were toy poodle, Yorkshire Terrier, Pekingese and Chihuahua. Scaling and polishing time, possible treatment time after the first injection of anesthetics, the number of anethesia added, presence of tongue movement during anesthesia, the presence of swaying sign during recovery and respiration were evaluated. The possible treatment time after the first Injection of anesthetic in toy poodle were 26.3${pm}$3.0 minutes with intravenous(IM) treatment of ketamine 10mg/kg, and 21.4${pm}$6.6 minutes with intramuscula(IM) treatment of zoletil 8mg/kg, In Yorkshire Terrier were 19.51: 1.7 minutes with IV treatment of ketamine 10mg/kg. 19.0${pm}$5.2 minutes IM and 20.8${pm}$6.1 minutes with IM treatment of zoletil 5mg/kg,24.8${pm}$3,5 minutes with IM treatment of zoletil 8mg/kg. In pekingese were 27.5${pm}$2.1 minutes with IM treatment of ketamine 10mg/kg,28.0${pm}$4.2 minutes with IM treatment of zoletil 8mg/kg. In Chihuahua were 19.5${pm}$1.9 minutes with IV treatment of ketamine 7mg/kg, 17.5${pm}$1.7 minutes with IM treatment of ketamine 10mg/kg and 20.3${pm}$3.8 minutes with IM treatment of zoletil 5mg/kg, 21.2${pm}$5.5 minutes with IM treatment of zoletil 8mg/kg. Swaying sign was observed in all group during recovery time, espically, in toy poodle and Yorkshire Terrier which administered zoletil 8mg/kg IM showed more severe swaying sign. The present results suggested that injection of zoletil 8mg/kg IM might be relatively effective for scaling in Chihuahua Within 20 minutes treatment for scaling in Yorkshire Terrier and Chihuahua, IM treatment of ketamine 7 to 10mg/kg is recommended.