I have had chihuahuas since 1984, Toby my first was a boy he died age nearly 16 years old in December 1998, we also had 2 girls at the same time, Sully a pup and Penny a rescue, the girls fought for top dog at first but settled down within a short while.We then got 2 more girls Fynn and then Rosie another rescue, they know who is topdog and all down the line and are all settled. Sadly Penny rescued Aug 1998 died of heart disease/water on her lungs on 11th February 2003.I love all chihuahuas but now prefer to have all girls, ( i do not breed).