Introducing puppy to my dog of 2 years

Hi! My gf and I just adopted a 4 month old female Australian Cattle Dog. We already had a 2.5 year old corgi at home (got him when he was roughly the same age as the new puppy).

Our corgi has always been really friendly with other dogs/people. Even when I first moved in with my gf, her old roommate was still in the house and she had two bigger dogs (German Shepard, 4yo, Rottweiler, 9yo). Granted he moved into the other two dogs house, but they got along great.

Skip forward a few months, those dogs aren’t here anymore, they moved with the roommate and now we introduced the corgi to his new sister but he seems quite defensive around her. Doesn’t like it when she gets close, usually walks around her. Really locks in on her when she gets on the couch next to my gf. Definitely new/weird behavior I haven’t seen from him before.

It’s only been 2 days and I assume if I keep their interactions positive, rewarding treats and whatnot for good behavior it might be ok. But curious on others thoughts. Any ideas on this situation?

submitted by /u/swamp_donkey26
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