So, this word of advice to anyone whose dog is on phenobarb, who is terrified by <span style = 'background-color: #dae8f4'>symptoms</span>
that mimic an aggressive brain tumor--don't panic. It might be a tumor (heck, my dog still might have a tumor), but it is also possible that it's the phenobarbital. Try to keep a log of what your dog does every day. Does he stop tripping one day? Does he manage to stand all through dinner one day? The progress is very slow. But if it's just drug side effects, it will get better.