Since many people have Golden Retrievers as their service dog, I thought I would include this study. Interestingly, my previous Golden Retriever was spayed at 7 mos and was definitely longer-legged than her siblings who were not (conformation dogs). She lived to 12.5 years with no health issues until the very end she had an undiagnosed tumour in one of her nails. We had the toe removed. She died of a multiple back to back heart attacks in a few hours a few months later.
If you remember back in history to the days of castrated male choir boys (called castrati), you may remember that in all the pictures, the boy were very tall and thin. This is because when the testosterone is removed at a young age before they have stopped growing, it is not present to tell the bones to stop growing at the normal age. Their bones ended up being longer and thinner than they would have otherwise been so they ended up being taller too. This also resulted in the rib bones being longer which meant a greater lung capacity. That was good for singers. Of course the lack of testosterone affected their voice box too so they had much higher voices for singing and their voices never deepened as a normal teens would. Altered dogs also show a noticeable increases (chest "drops") in the rib cage.