The dog is a very intellignet animal and it can be trained for many duties. Some dogs work with the police and the army as sentries and trackers and there aer medals that are awarded to dogs for bravery in action. Other dogs act as seeing -eyes for the blind and some breeds are specially trained for rescue work among mountains and snow. Jobs like herding sheep and cattle and guarding homes are also done by them. Whenever man lives and works in the Arctic Circle, in the desert, in the jungle, in the moors or mountains , the dog is his faithful companion and help. A common mongrel may possess these qualities just as much as the aristocratic bloodhound .
The phrase 'aristocratic blooedhound' in the passage means