Many same sex puppies get along throughout their lives. Many of mixed sex pairs do the same. I have found in my practice if fights/conflicts arise then two females can be the worst. Two males are less likely in fights/conflicts especially if they are both neutered.
Can 2 Male Un-neutered Males Live Together? The short answer is yes, 2 intact males dogs can live together. However, depending on each of their personalities, they may or may not live in harmony together.
The Australian Cattle Dog gets along with other dogs in his household, especially if he's been raised with them from puppyhood. However, because he is so devoted to one person in a family, there can be jealousy or squabbles between the Australian Cattle Dog and other dogs.
Can Two Male Cats Live Together? Yes, it mostly involves whether their temperaments line up. If you have two laidback males, they are likely to get along just fine. Two territorial males may drive each other nuts, though.
While many female dogs do get along peacefully, adopting two puppies of the same sex can sometimes be like playing Russian roulette, their future may be a question mark. As cute as they may be, please try to consider that in the future one of them may have to be re-homed simply because they do not get along.
Interestingly, when you have more than one dog or cat, the opposite sexes get along better. Maybe they see each other as less of a threat when it comes to their mating instincts or their place within the social pack. And spaying and neutering have alleviated many of the gender-specific problem behaviors.
Many people do not give two dogs time to adequately adjust to one another before deciding that having two dogs will simply not work. It can take up to one month for an old dog and new dog to really settle in and accept each other's position in the pack.
Introducing a puppy to an older dog is more likely to go smoothly if you set yourself up to succeed by following these top tips:
There isn't research for dogs, as there is for cats, that show how long it takes dogs to adjust to each other. Phifer, however, says that two to four weeks is usually enough time to know if dogs can be friends.
Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it's possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs. This is what happened to the woman in New Jersey.
Let your dogs sniff each other and greet each other normally. Give them positive reinforcement through calm verbal affirmations. After letting them play for a while, put both dogs in a “sit” or “stay”, then let them interact again. Finally, take them on walks together, allowing them to sniff each other along the way.
Help! My Cat and Dog Don't Get Along - How to Introduce your Cat and Dog
Try to introduce them on neutral territory. Keep them separated until they show friendly body language to each other. A see-through fence is good for this, since having a dog on leash disrupts the dog's body language and can actually cause a fight. If you must use leashes, keep them loose, not tight.