Check out this interesting article about behavior changes post-spay/neuter. A pretty well-known and respected Dane breeder shared it, and I thought some here would like to see it. It really contradicts what we're usually told/expect (in the US at least). The references are at the bottom of the article. The sample sizes in the two studies are pretty impressive as well.
https://www.psychologytoday.com/blog...ed-or-neutered
https://www.psychologytoday.com/blog...ed-or-neutered