If your Smooth Scottish Fox Terrier is good at scenting, you may want to try entering a tracking trial. This type of sport is great for both you and your dog as it gets you both out walking or even running in the fresh air. Just laying out a scent trail for your pooch to follow gives them the opportunity to show off their scenting and tracking skills.
Lure coursing is similar to tracking, but your dog is tracking by both sight and scent. In this interesting sport, your dog is trained to go after a moving target (fake prey) attached to a mechanized line through grass and brush. When they get their prey, make sure they are properly praised so they will want to continue to chase.