Welcome to the board. You have a very hard question on your hand to decide.. You have heard a lot of good/bad points. It seems that females (dogs) that are fixed, doesn't seem to show any disadvantages. Males however can be agressive and then very sullen after being fixed. The points you have to weigh are, do I ever want to breed my dog if he becomes good. Do I take a chance on him becoming non-agressive in the field and at home.
I do believe that females not spayed and not having a litter have more of a chance on getting cancer because of toxins built up during the times they come in heat.
You do have a decision to make, and a hard one. Personnaly I don't want my male squatting like a female, and no I didn't have my 17+ month old setter fixed.
