Why do my unneutered male dogs fight indoors near spayed female?

Neutering both dogs at 1 year of age may help if this is related to the female (male dogs may still try to claim possession of her even if she is fixed). If the younger dog is already exhibiting undesirable behaviors, you may look at neutering him now. There is a possibility this is not related to the female. Working with a professional trainer may be your best option. Also, after the neutering, the hormones will still be around for about a month so it’s not instantaneous. I hope this helps.

Hormonal changes that occur after being spayed or neutered can sometimes cause tensions. Keeping the dogs separated unless supervised may help reduce fights. If you notice one or both dogs becoming too excited or agitated, separating them and giving them a chance to cool off can help. Removing items of contention such as treats or toys can also help reduce fighting. If the fighting continues, or they are unable to be together at all, seeking out a local veterinary behaviorist or trainer in person that can observe their behavior may be useful for formulating a training plan to help both dogs get along again.

At this stage you are not likely to correct this behavior. It is not uncommon for two female dogs that are not spayed to fight. You can have one or both of them spayed - that might help but there is no guarantee. The best thing to do is keep them separated at all times. If they have to be in the same room together then I suggest you keep basket muzzles on them so they can't hurt each other. ( https://www.amazon.com/Baskerville-Ultra-Basket-Dog-Muzzle/dp/B0051H45GC )

When you have two bitches together, they will show aggression to compete for territory and intact males especially if they are in heat. The best thing to do is to have both of them spayed. This will reduce the aggression between them as it is most likely hormonally related. It will also eliminate the risk of a pyometra, which is a life threatening infection of the uterus. Without spaying them, you will have a very hard time reducing the aggression because it's hormonally related. Removing the source of the hormones is the best way to stop the aggression.

It is possible that your younger dog being unneutered may be contributing to the aggression between the two of them. I would also try to think of the situations in which they have fought to see if there are any toys or other resources that they may be protective of. Consulting with a veterinarian or behaviorist may be indicated to determine the best way to move forward with both of them.

Since he is unneutered he may be picking up on her scent even if she is spayed, it's also a way to show dominance over other dogs. If you don't plan to breed him I suggest getting him neutered. This will help the behavior lessen over time and will also prevent some potential health problems as well as reduce the urge to roam and possibly get injured if he escapes looking for a female in heat. You can try getting him obedience training so he will be better behaved and more likely to listen when you try to separate them.

It's best to have a vet evaluate your dog's injuries after flushing any wounds thoroughly with normal water. To prevent this fighting, you have two options: 1) Keep the dogs seperated 2) Get the dog spayed/neutered Otherwise the fighting will continue and there's really not much else you can do about it. I hope that helps and everything is OK.