Here are some links we thought you might find helpful.

Border Collie Rescue: Border Collie Rescue
Four Paws: Animal welfare society
HoliDogz: Pet-friendly accommodation
PetFit: Canine fitness centre
SABOX: The South African Boxer Breed Council
Southern Sitters: House- and pet-sitting service
Tanyati Boxers: Gauteng breeders
Vesper on wheels: Facebook group that chronicles Vesper and her disabled friends' lives, and posts regularly about helpful hints, modalities, products and research on disabled dogs, especially IVDD, DM, hip displasia, etc.
Vet Products Online Online vet products store

Links provided without recommendation or liability