Sam is 15 weeks .. we take him for 2 walks a day one is a walk round the local wood off the lead, this takes about 45 mins and his evening walk is about 15 / 20 mins. He is not tired during his walks and if he does not get his walks, he goes mad running around the house. But am i over walking him ... i read on the web that he should only be having 15 mins x 2.