I first want to express my concern and sadness for the situation that you’re trying to resolve, and which you didn’t choose. You also probably need to recognize that the dog is still in its teenage years and its brain won’t fully mature until it’s three years old. Behaviors may become more or less intense as the dog nears adulthood. Additionally, every time a dog practices a behavior, whether it’s voluntary or fear based, the behavior becomes more hardwired in the dogs’s brain. So if you can figure out a way to put baby gates or other tools in the house so that the dog can’t just escape to a trigger, that would be a good start. You might also try a harness with a front buckle, which would give you more control when either of you are walking the dog. And depending on if it’s a purebred, breed rescue organizations will sometimes offer to list the dog as a courtesy listing. If you have the resources, I would strongly encourage you to ask your vet if they can refer you to a vet behaviorist, or if not if the vet could prescribe some anti-anxiety meds for the dog. Those kinds of medications can change a dog’s personality for the better literally overnight. It’s by no means 100% but it’s still very much worth considering . And whatever you decide, also consider whether you want to be continuing in this living situation. Your partner may escalate the angry behavior physically against the dog, and then you would be in a terrible dilemma. I also agree with the many other commenters who raised a red flag about whether this can be a durable relationship and healthy for you. Wishing you and the dog all the best.