Terriers are definitely amazing dogs and even though there are thousands of different Terrier breeds, they share a common element: they are all intelligent, independent and unique dogs. This is why developing a Terrier Breeding forces you to take certain cares in order to make the best out of the particular breed you choose. In this sense, it is of extreme importance that you make a proper tracking of other dog's pedigrees and bloodlines in order to be sure that they are the quality you want for your dog. This will help you prevent any possible health complication.
When Breeding a Terrier you also need to take into account that these dogs are usually quite territorial and that should therefore be quickly sold before developing a strong bond with you and your family. Plus, they need to count with all the correspondent vaccines and tests because some breeds display tendency to certain acquired diseases.
Terriers are certainly loving and obedient dogs but they can also sometimes be quite independent and show a free spirited attitude. Correcting this feature since puppyhood is definitely important to make the best of these incredible dogs. Otherwise, any Terrier can become a hard to handle dog.