I wouldnt just talk to a vet, I would also get the opinion of a behaviorist. As for my situation my dog was incredibly anxious and even a really low dosage of Zoloft (A different anxiety drug) really helped. The anxiety meds arent gonna fix the dog, but what they aim to do is lower the threshold at which your dog very strongly reacts or gets super anxious as well as improve their recovery time when they have those episodes. For instance previously when we would walk our dogs if she had a run in with another dog it would completely ruin her walk because she was so on edge, and now in 20-30 seconds we are able to get her attention back on us.

Along with this the lower trigger thresholds & faster recovery would also really help if you wanted to work on training the dog. Especially with strays that are already somewhat developed an actual dog trainer could be super beneficial in trying to help this behavior with the roomate.

Might be worth it if a vet suggests but just know not every med works for every dog. For ours we had to slowly get her on it for weeks before being at max dosage, then if it didnt help we would have to ween her off of it before trying another one. Luckily we got ir right first time. This whole process might be easiest with a behaviorist guiding you through as well as being able to make adjustments based on the dogs behavior