Petfinder and AdoptaPet.com can both be searched for border collie puppies that need homes. These sites allow local shelters and adoption agencies to upload profiles of pets that need to be adopted.
Petfinder has a brief overview of the border collie breed, including personality traits, size and origins. The site lists similar breeds, so users have alternatives if this specific breed is unavailable, and users can search for pets based on location, age and other factors.
AdoptaPet.com has more detailed information about the breed and has similar search features. The site automatically detects where the user is located to find local shelters that may have the requested breed.