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Incidence of Health and Behavior Problems in Service Dog Candidates Neutered at Various Ages

By Marta Zlotnick, Virginia Corrigan, Erin Griffin, Megan Alayon, Laura Hungerford

Category Journal Articles

Saint Francis Service Dogs (SFSD) trains dogs to aid people with multiple sclerosis, brain injury, and many other conditions. Organizations like SFSD must carefully consider when to neuter dogs to give them the best chance at successfully completing lengthy and expensive training. The objective of this retrospective cohort study was to assess differences in the incidence of health or behavior problems leading to dismissal between
dogs neutered at different ages. Data on 245 dogs—including birth date, sex, neuter date, dismissal or successful completion of training, and (where applicable) reason for dismissal—were collected from SFSD records. Age-at-neuter was grouped (<7 months; 7–11 months; >11 months) and compared for dogs who successfully completed training and dogs who were dismissed. Dogs neutered from 7 to 11 months of age were dismissed at a significantly lower overall rate than dogs neutered at an older or younger age. There were no differences between males and females. Labrador and golden retrievers were less likely to be dismissed than other breeds. This pattern was the same for dismissals for behavioral reasons. Dogs neutered at <7 months had more than twice the risk for health-related dismissals as dogs neutered at any older age and this pattern held for orthopedic dismissals. Labradors were at higher risk for orthopedic-related dismissal than golden retrievers and all other breeds. This study suggests that there is a relationship between dogs’ age at neuter and the incidence of health and behavioral problems that can lead to dismissal from service dog training.


Marcy Wilhelm-South

Purdue University

Date 2019
Publication Title Frontiers in Veterinary Science
Volume 6
Pages 7
DOI 10.3389/fvets.2019.00334
Language English
Additional Language English
Cite this work

Researchers should cite this work as follows:

  1. Animal roles
  2. Behavior and behavior mechanisms
  3. open access
  4. Service animals
  5. Spaying and neutering
  1. open access