Saying this will get the dog to eat "faster" is a bit misleading in a way. The intent is not to teach the dog to eat in 30 seconds or less, just to eat in a reasonable period of time. If you look through the forum, it's been discussed that allowing Shelties to pick at their food throughout the day is actually less beneficial than limiting meals to 20 minutes.
Please let us know what your breeder suggests since that information could help someone else with a similar problem in the future. Having multiple methods to approach an issue is beneficial.