I can only comment on my own personal experience, but Henry was ignorant to begin with and was ignorant when he came home from being neutered, ha ha ha! But I found by treating him no different, he came good and now we share a loving relationship, on his terms – bugga!
I suppose what I’m trying to say is, it didn’t change Henry! Only time and patience on my end did. And without knowing this for a fact, I believe the same would have happened if he didn’t get neutered.
BUT I HAD to have the procedure done – Henry sprayed! and marked his territory (US) with poop and we didn’t enjoy him the way we can and do now. So, for us, that is a positive that strengthened our relationship. Otherwise I think we would eventually have locked him out of our room – no fun for anyone. Henry is never overly affectionate, but have had licks from him after I give him a good pat. This took place a year after he became a family member, never before. So no, I personally never saw any difference in my boy after his neuter. It all just got better with (lots) time.
PS – Frank is my dog’s name. Such a COOL name!