Here are several good articles on health studies concerning neutering or spaying your dog.

There is mounting evidence that neutering or spaying your puppy too early can have negative

health effects in the long term. Veterinarians hold a wide range of views on this topic so self study

is well encouraged before making a decision to have your dog neutered or spayed.

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http://www.dogsnaturallymagazine.com/spay-neuter-and-joint-disease/

 

https://www.ucdavis.edu/news/neutering-health-effects-more-severe-golden-retrievers-labradors#.VDk_fXGKEs0.facebook