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Evaluating the Effectiveness of Selective Breeding and Corrective Surgery on Entropion in Labrador Retrievers From a
Lynna C Feng1, Diana L Alvarez1, Lauren M Holtz1
1Guide Dogs for the Blind, San Rafael, California, USA.
Veterinary Ophthalmology
|September 26, 2025
Summary
Selective breeding significantly reduced entropion incidence in guide dogs by over 50%. This strategy, combined with early surgical repair, proves effective for managing this common canine eye condition.
Area of Science:
- Veterinary ophthalmology
- Canine genetics
- Animal breeding
Background:
- Entropion is a common congenital eye condition in dogs.
- High heritability of entropion necessitates genetic management strategies.
- Guide dog programs require healthy dogs with optimal vision.
Purpose of the Study:
- To assess the effectiveness of selective breeding in reducing entropion incidence.
- To determine the heritability of entropion in Labrador Retrievers.
- To evaluate the success rate of surgical entropion repair in puppies.
Main Methods:
- Retrospective analysis of medical records from 4064 Labrador Retriever puppies.
- Comparison of entropion incidence before (2013-2016) and after (2020-2024) selective breeding implementation.
- Bayesian logistic regression to estimate heritability and compare risk.
Main Results:
- Entropion incidence decreased from 6.46% pre-breeding to 3.12% post-breeding.
- Dogs in the post-selection cohort had 1.96 times lower risk of entropion.
- Heritability (h² ) for entropion was estimated at 0.80; 90.61% of surgical repairs were successful.
Conclusions:
- Selective breeding is a highly effective strategy for reducing entropion in genetically predisposed populations.
- Early surgical intervention for entropion demonstrates a high success rate with low recurrence.
- This study validates genetic selection and prompt treatment for improving canine eye health.
