With the hypothesis that different sensitivity to stress would be seen between dogs that becomes guide dogs and dog not so, we compared the results of the number of white blood cells, the heart rate, and the blood pressure that related to their stress. It was thought that there might be differences not only in the sensitivity to stress, but also in the recovery from and the resistance against stress, and the same test was done the next day and two weeks after being moved to the training center from the puppy raiser's home. But there was little difference in the results from the next day and two weeks after, and between the dogs that became guide dogs and dogs that did not. However major difference between the dogs that became guide dogs and the dogs that did not was the fluctuation of their heart rates. The results were similar for the next day and 14 days later. Then, when the number of test dogs was increased and the fluctuations in the heart rates were investigated, the results were similar to the previous testing. According to these results, there are differences in the recovery and the reactions to short-term stress like the electrocardiogram measurement and tolerance against and the recovery from long-term stress including entering the training center and kennel life between dogs that become guide dogs and dogs that do not. It was thought that this test was effective as one of the early aptitude judgments because the electrocardiogram was a test that was able to be relatively easy-to-use, and because the results were clear.

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As mobility service dogs use their teeth to pick up fallen objects, pull wheelchairs and open refrigerator doors, it is often found that the transitory load is placed on their teeth, jaw bone and TMJ, etc. So, We experimentally measured the bending strength of the teeth taken from a beagle used in another experiment. The bending strength of the beagle canine tooth was 176.7MPa for the crown, 152.4MPa for the cervical part, 174.4MPa for the radicular part, with the average being 167.9MPa. Converting the measured values to Newtons (N) gives 3468.0N for the crown, 5212.3N for the cervical part and 5608.5N for the radicular part. When pulling a wheelchair with a 60kg person from the road to the pavement, the necessary strength is about 260~500N (26.5~51kgf), so it is discovered that the extent of the load for pulling a wheelchair does not fracture canine teeth. It is inferable that large dogs need much load on their teeth to be fractured.

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[in Japanese]

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