Border Collies are a fantastically healthy breed in the grand scheme of purebred dogs, but they do have many health concerns to balance when pairing dogs to breed, both genetically testable and unknown inheritance. Physical health concerns that cannot be predicted with a simple DNA test include: Hip Dysplasia, Epilepsy, Auto-Immune Diseases, Allergies, Shoulder OCD, Cataracts, and just not being structurally sound.
I encourage you to review both the page for Border Collies on the OFA website, and the American Border Collie Association's resources to get a broader view of health issues in the breed. Please note that both are outdated for a completely comprehensive look at health issues in border collies, especially in regard to DNA Testable diseases.
Research, genetic testing, and calculated risks are all part of breeding dogs. I am happy to answer any questions about my dogs health, and all of their health testing can be found on their individual pages. I do my best to learn about my own dogs lines and any lines that I am interested in breeding to. I encourage all puppy buyers to take ownership of being well-informed as a buyer, and proactively research any health issues they are particularly concerned about. Some ways to go about this are talking to others at trials that are familiar with the lines of dogs you would be getting a puppy or dog from, and utilizing online resources such as breed-specific facebook groups.
I do my best to breed healthy puppies with enjoyable temperaments while prioritizing work, and I am happy to share the health testing results of the parents of any litter I breed. I will always provide support if any health issues that arise, genetic or otherwise, and take back any dog I produce for any reason. I do not offer a money-back guarantee on the health of my puppies, because when you buy a puppy you are buying potential and the odds stacked in your favor. It is still a living animal with many potential enviornmentally influenced and genetic issues that could arise. It would be dishonest of me to say I can predict your puppy's health or guarantee a breed-specific issue that does not have a straightforward DNA test will not arise in your dog.
Puppies are always a gamble even when you plan to the best of your ability. Guarantee contracts also usually involve reliqnuishing the puppy in order to get a refund, which many owners do not want to do because they love their dog. Instead, I highly recommend puppy owners purchase pet insurance for the first 2 years of life of their puppies at minimum, and this will mitigate costs if any issues do arise-Vet care costs are only getting more expensive.
Though I do not think every working cross is well-suited for the physical requirements of certain dynamic sports such as international level agility, my dogs are bred with career longevity in mind including evaluating which lines break down before old age and which continue to perform well. What makes for functional structure of a dog moving to work stock is not always what makes a dog that is capable of turning on a dime mid-air and routinely jumping 2 foot jumps, but by the same token there is no sport line that never produces dogs that aren't ideal speciments for sports either. Puppies are and will continue to be a gamble no matter what breeding you choose.
Longevity of general health and working career is extremely important to me and what this breed has been known for, for a very long time; Thanks to working breeders selecting for functional structure by assessing this longevity. Working dog handlers and breeders expect and want our dogs to be capable (and not painfully) working into the double digits. I pay close attention to how dogs move when they're working and subscribe to the belief that form follows function, I would much rather watch a dog in motion and at different gaits than watch it stand still to be evaluated.
This is a reason I favor breeding to older males when possible beyond being able to see what they've produced. You know if they have continued to move well throughout the entirety of their career, and are as sound as a 7 year old as they were when they were a 3 year old. As someone who has previously competed at a high level in a wide array of dog sports, if there is something about the breeding that leads me to believe the puppies will not have good aptitude for certain sports, they will not be placed in those types of homes.