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| dog_id | name | father_id | mother_id | level | relation |
|---|---|---|---|---|---|
| 7 | GrandSon | 5 | 6 | 0 | |
| 5 | Son | 1 | 2 | 1 | father |
| 6 | Daughter | 3 | 4 | 1 | mother |
| 1 | Father | null | null | 2 | father |
| 3 | Father1 | null | null | 2 | father |
| 2 | Mother | null | null | 2 | mother |
| 4 | Mother2 | null | null | 2 | mother |