Breeding suitability guide — Border Collie
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 |
|---|---|---|---|---|
| Collie eye anomaly (CEA) (CEA) | — | Clear or Carrier | Autosomal recessive | CIDD |
| Merle coat pattern (M) | — | CARRIER | Autosomal dominant | Legacy |
| MDR1 gene mutation (drug sensitivity) (MDR1) | — | Clear or Carrier | Autosomal recessive | HD-Curated |
2. Mating rules
When one parent has a borderline result, the other parent must meet specific criteria.
Merle coat pattern (M)
Polygenisch — beide Elterntiere sollten mindestens das Ergebnis "CARRIER" erreichen. Idealerweise besser. Phenotypen aus belasteten Linien sollten nicht für die Zucht herangezogen werden.
LegacyCanine cyclic hematopoiesis (GCS)
Autosomal rezessiv: Zwei Träger (CARRIER) dürfen nicht miteinander verpaart werden — 25% der Welpen wären betroffen. Betroffene Hunde sollten gar nicht in der Zucht eingesetzt werden.
LegacyDental hypomineralization (DH)
Autosomal rezessiv: Zwei Träger (CARRIER) dürfen nicht miteinander verpaart werden — 25% der Welpen wären betroffen. Betroffene Hunde sollten gar nicht in der Zucht eingesetzt werden.
Legacy3. Recommended additional tests
Sensible additions for line planning.
| Test / condition | Scoring scheme | Approved from | Inheritance | Source |
|---|---|---|---|---|
| Canine cyclic hematopoiesis (GCS) | DNA | CARRIER | Autosomal recessive | Legacy |
| Dental hypomineralization (DH) | Physisch | Clear or Carrier | Autosomal recessive | Legacy |
| Microphthalmia | — | CLEAR | Complex | CIDD |
| Progressive Retinal Atrophy (PRA) (PRA) | — | CARRIER | Autosomal recessive | CIDD |
| Cataract (HC) | Augen | CLEAR | Complex | CIDD |
| Lens luxation (PLL) | Augen | CLEAR | Autosomal recessive | CIDD |
| Pannus (Chronic Superficial Keratitis) (CSK) | Augen | CLEAR | Complex | CIDD |
| Hip dysplasia (HD) | Roentgen | B or better | Polygenic | CIDD |
| Congenital deafness (CHSD) | Physisch | BILATERAL_HEARING | Complex | CIDD |
| Cerebellar abiotrophy (CA) | DNA | CLEAR | Autosomal recessive | CIDD |
| Adult-onset deafness (AOD) | DNA | CARRIER | Autosomal recessive | Legacy |
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'