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How long does it usually take for two dogs who live together to establish dominance?

We just adopted a Cardigan Corgi and our first corgi, Eva the Diva, is living up to her name - she's herding him around the backyard,nipping and mouthing him, shoving herself in front of anyone giving the new dog attention, etc. etc. 

I'm aware that this is a normal part of having two dogs, and as long as there's no blood, I'm fine, plus both dogs consider me the alpha and a sharp yell from me usually makes them stop if they're jostling in the house (outside, it's their business and I try not to interfere).

Anyone have a ballpark on how long this might take?

It really depends. If your original dog is usually dominant around other dogs it may take a couple weeks, if she's usually pretty submissive it can take a day or two. It seems like you're doing the right thing by letting them work it out, and as long as they both view you as the alpha, I wouldn't worry too much.

ETA: I have a degree in Animal Science and worked at a boarding facility for over 2 years, so I have some experience with animals. I've also volunteered at animal shelters and rescue groups for over 10 years. lol

Just wanted to add that making her "Sit" and "Wait" while the other dog gets attention might be a good idea, too.  Our dog thinks any pet getting attention means he should get attention, too.  He isn't aggressive at all about it, he just wants in on the fun.  Following what I saw on an episode of "It's Me or the Dog" we make him sit and wait, and tell him "(Insert other pet's name here)'s turn!" while we pet the other dog/cat.  Then we tell him, "Alright, (Insert pet's name here)'s turn!" and then pet him.