Many of them get extremely agitated around kids, thinking they have to be stopped and controlled like livestock. When looking for a Border Collie pup, make sure that you see the parents, and can assess how they respond to your children. If the adults are fearful , stressed or aggressive, then in all likelihood the pups will be too. Ask for proof that the breeding stock has been cleared for hip and eye problems before being bred. Most anomalies won't show themselves for several years.
Many people simply allow their dogs to breed and then sell the pups.
A good and conscientious breeder may make you feel a little uncomfortable grilling you about your knowledge of the breed, to make sure you have an idea of what you are in for. A good breeder will care about where their pups go and follow up with you to see how it is doing. A good breeder will insist that if you decide at some point that you cannot keep your dog, you contact them , and they will make every effort to rehome it. A good breeder will keep the pups until they are at least 8 - 10weeks of age and administer a deworming and their first set of shots. Keeping the pups together helps to ensure that the pups learn good behaviour from their mother and littermates.