Here is a link. Not sure if it was THE link..
http://www.naiaonline.org/pdfs/LongTermHealthEffectsOfSpayNeuterInDogs.pdf
For the person who's clinic was doing because of aggression. There is a fair bit of evidence that shows spaying can INCREASE aggression in bitches. Why not fix the problem with training vs altering the hormone production of a growing animal?
http://www.naiaonline.org/pdfs/LongTermHealthEffectsOfSpayNeuterInDogs.pdf
For the person who's clinic was doing because of aggression. There is a fair bit of evidence that shows spaying can INCREASE aggression in bitches. Why not fix the problem with training vs altering the hormone production of a growing animal?