Hi everyone, a newbie here Was hoping for some advice. We have an almost-two-year-old border terrier. We do many country walks, and usually keep her on a long extendable leash. While on a walk, she does not pull much, but she does the opposite - if she smells something interesting in the grass, she just stops there! And I need to give her a hard pull to get her moving again. Any advice on how I could stop this behaviour? I guess making her constantly 'heel' would work, but as we live in a countryside, we do like giving her some freedom when we can... Thank you!