Breeding suitability guide — Japanese Chin
For breeders: which tests, which thresholds, which mating rules apply
1. Mandatory tests for parents
These tests must be on file for every breeding animal.
| Test / condition | Scoring scheme | Approved from | Inheritance | Source |
|---|---|---|---|---|
| Cesarean section | Physisch | up to two caesarean sections | Complex | Legacy |
| Brachycephalic obstructive airway syndrome (BOAS) (BOAS) | Physisch | Grade 0 or 1 | Complex | Legacy |
| Ectropion / Entropion | — | CLEAR | Complex | Legacy |
| Patellar Luxation (PL) | Physisch | Grade 0 or 1 | Polygenic | Legacy |
| Cryptorchidism | Physisch | Normal (both testicles descended) | Complex | Legacy |
| Gangliosidosis, GM2, type I (B variant) (GM2) | — | Clear or Carrier | Autosomal recessive | HD-Curated |
| Paralyzed, permanently visible tongue | Physisch | No paralyzed, constantly visible tongue | Complex | Legacy |
2. Mating rules
When one parent has a borderline result, the other parent must meet specific criteria.
Ectropion / Entropion
Polygenisch — beide Elterntiere sollten mindestens das Ergebnis "CLEAR" erreichen. Idealerweise besser. Phenotypen aus belasteten Linien sollten nicht für die Zucht herangezogen werden.
LegacyPatellar Luxation (PL)
Polygenisch — beide Elterntiere sollten mindestens das Ergebnis "1" erreichen. Idealerweise besser. Phenotypen aus belasteten Linien sollten nicht für die Zucht herangezogen werden.
Legacy3. Recommended additional tests
Sensible additions for line planning.
| Test / condition | Scoring scheme | Approved from | Inheritance | Source |
|---|---|---|---|---|
| Cataract (HC) | Augen | — | Complex | CIDD |
4. HonestDog verification
- Upload a legible certificate (PDF or photo) per test in the breeder dashboard
- Certificate must show date, examining vet, and FCI/VDH logo
- Certificates older than 36 months are flagged as stale
- We check each upload for authenticity — the profile tile then shows 'verified'