OK................., I know I'm always banging on about this, but PLEASE - check and do the recommended health tests for Borders on your bitch; then look online for registered/KC assured breeders,
Ask to see stud cards showing pedigrees that fit in with that of your bitch, and their health test certificates too.
Decide which of these dogs is suitable, preferably with the help of a responsible breeder.
Work out when she is due in season and book the stud dog.
Anything else is wasting your bitch, risking her life, and that of any puppies she has.