The good news is that introducing a female to males is a lot easier than trying to bring another boy home. That is, unless the two males decide to start fighting for the lady's attention. To avoid conflict and to make sure Honey is accepted into the pack with open arms -- uh, paws -- some planning is in order.
Make sure everybody is desexed, and not just for the obvious reasons. If the two males are intact and you bring a female -- even one who's already spayed -- you're risking a world of trouble. The boys will suddenly feel the need to show who's the top dog to compete for the girl's attention. If everybody's been spayed and neutered, there won't be a lot of hormones to flare up, and fights will be much less likely.
“Make the initial introductions happen in neutral territory, if possible. The dog park is a great place -- for your boys, it's just a casual "hey, there's a new doggie to play with at the park!" If everybody gets along at the park, the fact that Honey ends up coming home with the boys should then appear to your males to be a happy coincidence. But introduce your new girl to the top dog first if initial contact takes place in your home. Even among littermates or males who grew up together, one of them is alpha dog. Give him the chance to say hi to the new household member first; then bring boy No. 2 along.
Remove all toys, bones and personal objects from common areas at first. If the female goes for a toy or treat that doesn't belong to her, two things might happen: either the boys will put her in her place or you'll have an all-out fight where everybody gets into it. You don't want the boys fighting with each other because of the newcomer, so remove anything that could cause trouble. Reintroduce the items slowly so you can teach everybody what belongs to whom.
- Keep your eyes open for signs of latent aggression, such as crouching the body, growling or hair raised on the back and neck. While chances are one of your boys is not going to attack the new girl, always be cautious when making the introductions.
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