my experience:  littermate pups out of Pancho. Two comparisons: Bulldogs on the left of both photos spayed and neutered prior to 1 year old / Bulldogs on the right kept intact.

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https://www.dogsnaturallymagazine.com/spay-neuter-and.../

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These are littermates - one was neutered pediatrically, the other left intact. Notice the permanent puppy-like body of the dog on the left. His head is narrow, his chest is narrow, his angulation is bad, he's taller than he is long because growth plates don't get the proper signals from testosterone or estrogen on when to close. This is what pediatric neuter does to your dog. It leaves them more susceptible to an incredible amount of health issues (joint issues, multiple types of cancer). Meanwhile, the only fact in favor of early neutering is to prevent unwanted litters which can be prevented by not letting your dog roam - something we should already be on top of as responsible dog owners. Dogs need hormones to grow and mature properly. Do your dog a favor and wait until he's completely matured before neutering!