In my house, there are 3 dogs total - 2 of which are female. All of the dogs are between the ages of 2 and 3.
When we moved in a year ago, my dog June (female boxer/lab mix) established dominance in a standard way. She went to Boots' (other female dog) water bowl and urinated beside it and also took a toy from Boots' dogs mouth. June did go down by Boots' bedroom 3 or 4 times and defecated and urinated - the final time I spanked her harder than I should have but we solved the issue with a gate so it no longer happens.
Boots was initially submissive and we had no problems, but then Boots began to get aggressive. Boots and June got into a couple of fights initially and both were reprimanded by being rolled onto their backs.
I controlled June and since that point almost 6 months ago, we haven't had issues.
Boots is a little wild (Indian Res. rescue dog) and has been challenging June for alpha. She will bark and nip at June for various things. June generally seems indifferent to Boots when she does this and actually attempts to play with Boots from time to time.
Last night, there was a male dog at the house and June went to greet it - Boots freaked out, hackles up and mounted June's head. I have NEVER seen June take a mounting, but she did last night. I should also add that Boots showed her teeth and growled at me a few nights ago. Boots' owner's girlfriend (also a roommate) seems to get pleasure from this, because she doesn't like June (because of peeing/pooping incidents) and is scared of June because she looks like a Pit mix.
Maybe it's just the protective dog owner in me that I need to let go, but I don't like this situation and want to deal with it appropriately. Has Boots taken alpha from June? If so, is there a way to take Boots down a notch? June is good with people and other dogs and has a calm energy. Boots on the other hand, has bitten me before and is a bit wild. I've talked to my roommate and he is aware but doesn't seem to be as bothered as me.
That's a lot of rambling and I can provide clarification and details if necessary. Thanks for reading!