"Dogs of Form and Function" 

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Greater Swiss Mountain Dogs

Dangers of Early Spay & Neuter

Consistent with previous studies on the topic, the results showed increased likelihood of hemangiosarcoma, lymphoma, mast cell tumors, and canine cruciate ligament (CCL) rupture in neutered dogs. The most profound observations were in hip dysplasia in male dogs when comparing early and late-neuteringConsistent with previous studies on the topic, the results showed increased likelihood of hemangiosarcoma, lymphoma, mast cell tumors, and canine cruciate ligament (CCL) rupture in neutered dogs. The most profound observations were in hip dysplasia in male dogs when comparing early and late-neutering.

What happens if you neuter a dog too early?
Spaying your dog too early can result in health problems later on since her hormones should have some time to work. Early spaying can increase the risk of hip dysplasia, torn ligaments, bone cancer, and urinary incontinence.

The most profound observations were in hip dysplasia in male dogs when comparing early and late-neutering. The risk of development of hip dysplasia doubles, and disease occurs at a younger age in the early-neuter group compared to both the intact and late-neuter group.

This is not the first time that the policy of early castration of male dogs has been questioned. Ru et al. ... The authors reported that neutered Rottweilers, both male and female, had a highly significant increased risk of developing osteosarcoma as compared to their intact counterparts. Studies now state this for all large dogs.