I have one like this. She has a noise phobia: big trucks, back up beepings, banging garbage bins, buses. She turns into a frozen vibrating mess...and won’t eat, nor is she treat motivated. She won’t walk at all in the neighbourhood with me, but will walk with my partner at night. Sometimes I stuff her in the car and we go to a “safer” park, and she seems to enjoy that, for the most part. (We have a very active lab cross that we have to consider as well). She is on medication, a small dose, but I am not sure how well it works. (Clomipramine, an antidepressant). There are other drugs one can try, however. For especially bad days, like garbage day, or holiday travel days, she is prescribed alprazolan, a benzodiazepine, which works great. If she could be on that everyday, we would have a chill dog that thoroughly enjoys her life, but it is an old school addictive drug, and we do not feel that is the solution here.
We have come to the conclusion that she is much less stressed if she is not made to walk every morning, so we have accepted that her life is somewhat more circumscribed than most dogs, and that is just the sad reality. Fortunately, she does not have separation anxiety, but does not like the idea of missing out either....Our little bundle of nerves and contradictions!
It has taken us a long time to not impose our idea of what a dog needs, and now that we have had an attitude adjustment, we are all happier. It is truly difficult to get over the fact the your dog does not want to go for walks. Oakley doesn’t even want to to go out to pee, and will hold it until she bursts...so she has to be carried to the back door. (Thank goodness she is small). She, more or less, will then freely go outside and do her business. Four months is a very short period, so things will likely change in many ways! Best of luck with your dog!