Genetic improvement of hip-extended scores in 3 breeds of guide dogs using estimated breeding values: Notable progress but more improvement is needed.

Two hip quality phenotypes-a hip-extended score assigned by a board certified radiologist and the PennHIP distraction index-were analyzed to estimate genetic parameters and to calculate estimated breeding values used for selecting replacement breeders. Radiographs obtained at 12-18 months of age were available on 5,201 German Shepherd Dogs, 4,987 Labrador Retrievers and 2,308 Golden Retrievers. Obtained by fitting a two-trait model using Bayesian techniques, estimates of heritability for the hip-extended score were 0.

Radiographic hip joint phenotype of the Pembroke Welsh Corgi.

Objective: To investigate the radiographic hip joint phenotype of the Pembroke Welsh Corgi.

Study Design: Prospective and retrospective cross-sectional study.

Animals: Pembroke Welsh Corgis (n = 399).

Chronology of hip dysplasia development in a cohort of 48 Labrador retrievers followed for life.

Objective: To determine the chronology of radiographic signs of canine hip dysplasia (CHD), specifically joint laxity and secondary osteoarthritis (OA).

Study Design: Longitudinal cohort study.

Animals: Paired littermates, 48 Labrador retrievers.

Un-united medial epicondyle of the humerus: radiographic prevalence and association with elbow osteoarthritis in a cohort of labrador retrievers.

Objective: To longitudinally characterize the radiographic appearance of un-united medial epicondyle (UME) of the humerus, evaluate UME association with osteoarthritis (OA) and consider its relevance to the elbow dysplasia complex.

Study Design: Longitudinal cohort study.

Animals: Labrador retrievers (n=48) from 7 litters.

The effects of lifetime food restriction on the development of osteoarthritis in the canine shoulder.

Objective: To report effects of age and lifetime food restriction on development and progression of shoulder joint osteoarthritis (OA) in Labrador retriever dogs.

Study Design: Longitudinal life-span, cohort study.

Animals: Labrador retriever dogs (n=48).

Diet restriction and ageing in the dog: major observations over two decades.

This report reviews decade two of the lifetime diet restriction study of the dog. Labrador retrievers (n 48) were paired at age 6 weeks by sex and weight within each of seven litters, and assigned randomly within the pair to control-feeding (CF) or 25 % diet restriction (DR). Feeding began at age 8 weeks.

Lifelong diet restriction and radiographic evidence of osteoarthritis of the hip joint in dogs.

Objective: To evaluate the effects of diet restriction on development of radiographic evidence of hip joint osteoarthritis in dogs.

Design: Longitudinal cohort study.

Animals: 48 Labrador Retrievers from 7 litters.

Estimates of prevalence of hip dysplasia in Golden Retrievers and Rottweilers and the influence of bias on published prevalence figures.

Objective: To estimate prevalence of canine hip dysplasia (CHD) in Golden Retrievers and Rottweilers and identify sources of bias in published reports.

Design: Prospective study.

Animals: 200 clinically normal Golden Retrievers and 140 clinically normal Rottweilers between 24 and 60 months of age referred for hip evaluation (group 1) and 93 clinically normal dogs evaluated for Orthopedic Foundation for Animals (OFA) hip certification (group 2).

Effects of diet restriction on life span and age-related changes in dogs.

Objective: To evaluate the effects of 25% diet restriction on life span of dogs and on markers of aging.

Design: Paired feeding study.

Animals: 48 Labrador Retrievers.

Evaluation of a radiographic caudolateral curvilinear osteophyte on the femoral neck and its relationship to degenerative joint disease and distraction index in dogs.

Objective: To determine prevalence of a radiographic caudolateral curvilinear osteophyte (CCO) on the femoral neck in various breeds and age groups of dogs and to evaluate its contemporaneous relationship with degenerative joint disease (DJD) and distraction index (DI).

Design: Cross-sectional prevalence study.

Animals: 25,968 dogs, including 3,729 German Shepherd Dogs, 4,545 Golden Retrievers, 6,277 Labrador Retrievers, and 1,191 Rottweilers.