Dog Fight

My friend has three dogs- two dachsunds and a chubby small terrier. They look so cute, unfortunately, two of the dogs are male and the other is a new comer- a female. The two male dogs are fighting each other over the female. It's so funny because one of the male dogs is very gentle and won't bite and be very docile with everybody. He will whimper for attention. He then starts fighting the other male dog who is the more aggressive dog and ends up beating the snot out of it. It's so funny the chubby small dog just keeps growling and then attacks the dachsund and pins it. My friend told me they fight over the female dog- over who gets to keep her. It's all about the hormones I think. The chubby small dog will forget about fighting when he is at a distance of not seeing the female dog. It's so interesting that all of them are not even fixed, and the female dog has not ever been impregnated. I think the male dogs are too old now and just trying to settle a score of whose the better dog at winning the female dog's attention.