For starters, Phifer tells WebMD that there are no set rules about good dog matches because all dogs – even within the same breed – are individuals.
So it’s not necessarily true that female dogs match well with male dogs, younger dogs or older dogs make better second dogs, or that two puppies always do well together.
Is it better to have two dogs of the same gender?
A male dog will have fewer issues with a new female dog, and vice versa. This has to do with dominance. Physical fights may occur as dogs of the same gender fight to become the alpha. But if you do get another dog of the same gender, a pair of males may be less likely to get into fights than a pair of females.
What gender can a second dog be?
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.
Is it OK to have two female dogs?
Two females can be a problem but it can be successful if one is dominant and the other submissive. If you have two dominant females, you could have problems. Female dog fights are some of the most vicious as they have been known to fight to the death. Spaying has nothing to do with it.