Although breed and age is not a factor when adding to your pack, more consideration is warranted on the
sex of a second dog.
I have seen recommendations to get
rid of a second dog if there are constant dog - dog aggression issues.
Some dogs are very easy going and will adapt to other dogs with little problem while other breeds are known for their aggressive nature and this can create a situation best avoided by adding a hot tempered dog with a mild mannered dog so consider this carefully before making your
choice of a second dog.
If you find that she tends to trigger aggression in other dogs, or becomes aggressive herself, then you may want to work with a pet behavior professional who can guide you in making a
selection of a second dog or counsel you on whether she instead might do best as the only dog in your home.Bringing a Second Dog into the Home