Hanne
Forums Sage
I think I'd just get a good, strong collar that won't break or come off, then take him to a location where lots of cars go by (preferably residential where speeds aren't too high) and just drag him along when he overreacts. Once he's inured to the stimulus he'll stop reacting.
Maybe I misunderstand this post - so I am sorry, but I personally think that this definitely is a very bad solution - the dog learns not to deal with its uncertainty and certainly not such a sensitive race as a Sheltie - Dog acting's not that way because the dog is disobedient but because it can not overlook the situation - we would never pull away with our children that way if they were afraid, hopefully not.
We take dogs into our lifestyle which is so far from what it was created for, so it is also our task to deal with / help our fur babies in such situations in a dignified manner.