I think, for the most part, the differences in dogs' personalities have little to do with gender. In the thousands of dogs I have dealt with over the years there have been probably an equal number of loyal, hyper, sweet smart, etc. dogs that are male, and that are female. I think such traits are much, much more related to the inate personality of the dog and to history, training and upbringing than to gender. Just like with human beings. (Although, with humans, females are definately smarter. )