I am in Denver for the next 4 months for work. I am needi g to arrange daily walks for my 2 dogs while I am at work. Too is my 10 year old and Gracie is my 3 year old. Both girls are herders. They live their walks and lots of attention. We have a yard, but the 6 foot fence probably will not keep Gracie from jumping the fence. We live in a corner with a busy street on one side. They are both very protective and I muzzle my older dog when out of the house. As sweet as my older dog is, she does have a history of biting.