This is a test of commonsense. Complete the next sentence:

How to avoid crossbreeding as a dog breeder
Choose a dog of the same breed.
To avoid crossbreeding, the main thing you have to do is to breed your dog with a dog of the same breed. Both dogs must be purebreds and have no other breed mixed into their bloodline in the past.
This can be determined through pedigree papers presented to you by the breeder. For example, if you have a dachshund, only breed your dog with another dachshund.