Assisting Decision-Making on Age of Neutering for 35 Breeds of Dogs: Associated Joint Disorders, Cancers, and Urinary Incontinence.
Level 3 - non-randomized controlled study
Level 3 by design analogy (retrospective multi-cohort study of veterinary patient records; non-human clinical data)
PubMed 32733924 · doi:10.3389/fvets.2020.00388
What was done
The authors expanded prior retrospective health analyses (previously conducted on Golden Retrievers, Labrador Retrievers, and German Shepherd Dogs) to evaluate 29 additional dog breeds and three varieties of Poodles (35 breeds total). They analyzed veterinary records to examine associations between the age of neutering (or remaining intact), sex, and the subsequent occurrence of joint disorders (hip dysplasia, cranial cruciate ligament tear/rupture, elbow dysplasia), specific cancers (lymphoma, mast cell tumor, hemangiosarcoma, osteosarcoma), and urinary incontinence.
What was found
Major breed-specific differences were observed regarding vulnerability to joint disorders and cancers after neutering. Small-dog breeds generally exhibited no increased risk of neuter-associated joint disorders, and only two small breeds (Boston Terrier and Shih Tzu) showed statistically significant increases in cancer risk. For most breeds, neutering age could be selected without increasing risks. Specific risk multiples were cited from previous work (2- to 4-fold increase in joint disorders for dogs neutered before 1 year, and 2- to 4-fold cancer increase in female Golden Retrievers neutered at any age), but the abstract does not report exact numerical effect sizes, sample counts, or p-values for the newly added breeds.
Why it matters
This study provides breed- and sex-specific empirical guidelines to help veterinarians and dog owners determine optimal neutering timing while mitigating risks of orthopedic conditions and neoplasia.
Limits
The abstract does not state the total sample size (n), breed-specific participant counts, or exact numerical risk estimates (e.g., odds ratios, confidence intervals) for the 29 new breeds. As a retrospective observational veterinary study, it is subject to confounding by lifestyle, environment, and potential veterinary hospital referral bias.
Cited by
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