Our Westie is 13 weeks old. What should we do about brushing his teeth? Should we start now?
Any help appreciated.

At thirteen weeks I would just get him used to handling his mouth, use your finger to gently rub his teeth and gums, but bear in mind when he starts teething they will be very sore. If you can get him used to this now, you shouldn't have too many problems with a toothbrush after he has finished teething.