I hope that this doesn’t sound harsh but at age 17 she is near the end of her life span.
If it was my dog I would do all I could to keep her comfortable, however I would not be aggressive with treatment or do additional testing, I would treat the symptoms with prescribed meds, diet, TLC.
I know how hard it is to be objective when you are emotionally involved, I’ve been there.
Most dogs don’t enjoy going back and forth to the vet and find it stressful.
That being said, every situation is different.
Please take a step back, talk to close friends and family. Take care.
