Researchers from the University of California, Davis have found that heavier mixed-breed dogs who are spayed or neutered early have higher health risks.
According to the study published in Frontiers in Veterinary Science, mixed-breed dogs that weigh over 44 pounds as adults are at an increased risk of one or more joint disorders if they have been neutered before the age of one. However, dogs weighing up to 43 pounds did not have the same risk.
Benjamin Hart, lead author of the study, said in a statement, "Most dogs are mixed breeds. We hope this study will influence the spay or neuter process in order to give people wishing to adopt a puppy the time to make an informed decision on when to spay or neuter."
Higher Risk In Neutered Dogs
It is standard practice in the US and much of Europe to neuter dogs by 6 months of age. This study, which analyzed 15 years of data from thousands of dogs at UC Davis Veterinary Medical Teaching Hospital, suggests dog owners should consider their options carefully.
Researchers examined common joint disorders including hip dysplasia, elbow dysplasia and cranial cruciate ligament tears, a knee injury, in five weight categories. They also looked at risks of mixed-breed dogs developing cancers based on weight but found no increased risk in any weight category compared to intact dogs.
The risk of joint disorders for heavier dogs can be up to a few times higher compared to dogs left intact. This was true for large mixed-breed dogs. For example, for female dogs over 43 pounds, the risk jumped from 4 percent for intact dogs to 10-12 percent if spayed before a year of age.
Neutering Policies Should Be Reviewed
"The study raises unique challenges," noted co-author Lynette Hart, professor at the UC Davis School of Veterinary Medicine. "People like to adopt puppies from shelters, but with mixed breeds it may be difficult to determine just how big the dog will become if you don't know anything about the dog's parents."
Neutering prior to adoption is a common requirement or policy of humane societies, animal shelters and breeders. The authors suggested the policy be reviewed and modified appropriately. Shelters, breeders and humane societies should consider adopting a standard of neutering at over a year of age for dogs that will grow into large sizes.
Lynette Hart said the study is especially relevant for people and organizations raising service dogs. "They need to take a serious look at this," said Hart. "Joint disorders can shorten a dog's useful working life and impact its role as a family member." A previous study conducted by the UC Davis researchers found health risks based on neuter age varied greatly depending on the breed of the dog.
(With inputs from agencies)