The only dogs that can be pulled out are westies and cairns, not jacks or patterdales like people think
you can damage their tails that way. (I was told this by a vet and a guy who works and owns patts)
Springers are thinner flicky type tails where as labradors have long strong and thick tails plus the fur is shorter so barbs don't get stuck like they do with springers.
I know of a guy who owns a few working pats and 3 of his 5 all have tails, he told me that it truth it is rare that terriers injure their tails, springers bounce around in brambles and go here there and everywhere. Ratting dogs often go underground or across open fields rather than woodland area, so in truth they really don't need their tails docked.