I have found the russell ,lakeland and patts tend to get smashed up alot more than the border terriers even when only 1 is to ground.
sometimes they are too hard for there own good
the borders seem to be alot more sensible ie:get the job done without getting smashed.
excellent post mate
i have even heard of terriers being suffocated below ground due to the 2nd dog closing the 1st one in