One of the most common questions we receive is, "When should I spay or neuter my puppy or kitten?" The answer isn't the same for every species—or even every breed. We believe these decisions should be guided by veterinary research rather than a one-size-fits-all recommendation. Because Maine Coons and Newfoundlands are both slow-maturing breeds, we recommend different timelines for each based on what the scientific evidence currently tells us.
For our Maine Coon kittens, we recommend waiting until around eight months of age, provided your veterinarian agrees your kitten is healthy and there are no circumstances that warrant an earlier procedure. Maine Coons mature much more slowly than the average domestic cat, but current research has not demonstrated significant orthopedic or long-term health advantages to delaying neutering well beyond sexual maturity. Studies have also shown that early-age neutering does not increase the risk of urinary blockages by causing a narrower urethra—a belief that has persisted for years but has not been supported by scientific evidence. Waiting until approximately eight months allows most kittens additional time to grow while still greatly reducing the likelihood of spraying, repeated heat cycles, and accidental litters.
Our recommendation for Newfoundland puppies is very different. We generally suggest waiting until 18 to 24 months of age, especially for males, unless there is a medical reason to perform the surgery sooner. Unlike cats, giant-breed dogs continue growing for an extended period, and sex hormones play an important role in normal skeletal development. Testosterone and estrogen help regulate the closure of growth plates in the long bones. Removing these hormones too early can delay growth plate closure, resulting in longer limbs and subtle changes in joint mechanics. Research in large and giant breeds has associated early neutering with increased risks of orthopedic conditions such as cranial cruciate ligament tears, hip dysplasia, and elbow dysplasia.
There are behavioral considerations as well. In cats, intact males often begin spraying and roaming between six and twelve months of age, and once those behaviors become established they may not completely disappear after neutering. That is one reason we recommend scheduling the procedure before those habits have a chance to develop. Dogs present a different balance of risks and benefits. While neutering can reduce some hormone-driven behaviors, good training, socialization, and responsible management are far more important predictors of a well-behaved companion than the age at which surgery is performed.
Ultimately, every pet is an individual, and no recommendation replaces the advice of your veterinarian, who knows your animal's medical history. Our recommendations are based on the best evidence currently available and reflect our goal of giving every Maine Coon and Newfoundland the healthiest possible start in life. As research continues to evolve, we'll continue to evaluate the science and update our recommendations when the evidence supports doing so.
