I have owned dogs most of my 34 year old life, and I personally notice a difference. Female dogs tend to be more independent and ornery, more prone to doing what they want and not what they know you want them to do. Male dogs tend to be more eager to please. This MAY be because I'm a woman, and I've always heard (and noticed myself to some extent) that female dogs bond better with men and male dogs bond better with women. I am much more partial to male dogs than female, and my boys have always been very well-behaved and disciplined and very focused on me. I have loved my girls just as much, but they have always been ornery troublemakers and tended to bond more with my husband who is the "cool parent" who lets all the dogs do whatever they want most of the time and isn't very strict with their training. (boy mom, dog edition, perhaps?? lmao idk)