For the happiest dogs and the safest household, opposite sex dogs almost always do best together. Many same-sex combinations of dogs will fight, sometimes to the death. Those who work out a dominance order may not fare much better.
What gender dog should I get if I already have a female?
In general, choosing the other gender is wisest. So if you already have a male dog, choose a female, and vice-versa. Select a younger dog (although, as stated above, not too young), as dogs close in age are more likely to have disagreements. Bringing in a dog older than your resident dog can create tension.
What gender dog should I get if I already have a male and female?
Experts recommend adopting a dog of the opposite sex, but two dogs of the same gender can get along. It depends on each dog's personality and level of dominance. If you decide to go ahead and get a dog of the same gender, some experts suggest bringing in a much younger dog than your current one.
