Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to avoid crossbreeding as a dog breeder [title] Choose a dog of the same breed. [step] 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.

Ending1: Consider a breed and breed mix that best suits your breeding space and your business goals. [title] Earn a percentage of profits from crossbreeding. Ending2: Plus, the exact laws are unknown from breeders. Therefore, finding a dog with a similar race, breed group, temperament, or color as an adoptee will be relatively difficult. Ending3: [substeps] Purebreds are bred the same way. When you think about selecting a purebred dog, you'll need to think about whether the dog is of similar breed or a mixture of two races. Ending4: [substeps] 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.

Answer format: ending1/ending2/ending3/ending4