When should I spay or neuter my Labrador for optimal health?

Hello, thank you for your question.

This is a very complex topic in veterinary medicine and you will hear/read about a variety of different opinions regarding this matter.

In my opinion, if you have a male Labrador puppy, recent studies have shown that leaving them intact until roughly 1 year of age helps with bone growth/development and has been shown to help decrease the risk of arthritis developing down the line. Some veterinarians even suggest leaving male dogs intact for as long as possible. However, as intact dogs age they are prone to developing problems with their prostate (such as infections, enlargement) as well as some dogs exhibit problematic behaviors.

In regards to female puppies, I recommend spaying them around (or before) 6 months of age, prior to their first heat cycle. The major reason for this recommendation is that the risk for mammary cancer goes up exponentially when a female dog is allowed to go through a heat cycle (i.e. the chance is <0.5%, after the first cycle and with subsequent cycles the risk increases to 26% or higher). Some veterinarians recommend leaving females intact as this helps to improve bone growth/decrease risk of arthritis. However, I feel that the risk far outweighs the benefit in female puppies. Mammary cancer is very serious in dogs and could mean additional surgeries/chemotherapy in their lifetime.

I hope this helps! As mentioned, this is a very controversial topic in veterinary medicine. These are just my feelings on the topic, based on research in the topic.