We have a 13yr old Labrador Bitch who absolutely refuses to walk on lead. Off lead through a wood or over the fields she is fine for her age and still chases after our 5 yr old Lab. This means that pavement walks are off limits which is a problem on days when the car is not available to go to the woods. She is on YouMove and has no problem with her mobility but as I said refuses to walk on the pavement. Any advice?