Well, I can't comment on Border Collies.

Border Terriers, however, are bred in kennels all over:
it is possible to find breeders of purebred Border Terriers
from Italy to Switzerland, in Scandinavia, and so on.
This is a current fact.
And it does not change the fact
that Border Terriers in particular have their ORIGIN in and around Scotland,
and this is true for terriers great and small.

If the preceding is true for the terrier,
why not for the Border Collie --
it is only logical --
that the Border Collie as a cultivated "pure" breed had its origins
in the border between Scotland and England,
quite some time ago,
and the DESCENDANTS of said breed can turn up . . . today . . .
in many places far from the Scottish Borders.