I've taken Genghis on my rollerblades for 2+ miles. I had to take breaks way before he did. I wasn't making him run fast, but he LOVES to run. I skated to the dog park and he still had plenty of energy to run around with the doggies at the park! (after a nice drink of water) on the way home he still wanted to run! That ends up being almost 5 miles! When we got home he slept the rest of the day
