Fernando México, International 1/31/2016 8:06:30 PM I used to run with all my dogs. The last ones were an Akita and a Napolitan Masttif mix (with Akita).They used to jog at 25 Km/hr (16 mi/hr);They used to run reaching 40 Km/hr (25 mi/hr);They used to do hurry walks at 11.5 Km/hr (7 mi/hr);We went outdoors (almost daily) for about an hour and a half per day. We could afford from 6 to 12 Km (3.5 to 7 miles) each day. We used to do many stops and speed changes along the travel phases.The akita (pure breed) could last longer and went farer than napolitan mastiff mix, because of their different weights.Before them, I used to run with a female cocker spaniel which weights 11 Kg (23.5 lb) and had a height size of 40 cm (16").It almost always kept an average speed of 10 Km/h (6 mi/hr). It was trained and was friendly so at the place where we used to run I almost never used a leash. Every time I got ahead, the dog was able to reach me easily, then every time it got ahead, it used to do stops to check other dogs tracks, smells and marks, and that gave me enough time to reach it without any additional concerns.Hope this info helps to understand what some breeds are able to do and gives a call to measure travel parameters and eventually could publish à dog breed endurance/speed chart with as most dogs breeds and fitness levels as possible.