I didn't go through everyone's responses, but Loki is now 14 months old. He was neutered at 6 months. He's never lifted his leg and he's 100% outside potty trained. However, he's very bossy and he does growl and bark a lot. We're working on this. (They are, after all, Yorkshire
Terriers 
)He's EASILY trained and highly food motivated. (Although, when I say easy I mean we spend about an hour a day working on "homework.) But he knows like 10 tricks and he obeys commands. He cuddles when HE wants, which is when he's tired or cold. Otherwise he's GO GO GO. He loves my mom (grandma!) and he loves to play with the dog next door yet seems to hate other dogs. He gets jealous REALLY easily (again working on that.) His nickname is "Monster" He wants to be the boss, but we don't let him get his way. I've never had a girl, but I'm going to guess that this is totally his personality and has nothing to do with male vs. female, but geting a male does not automatically mean marking, etc.