Yes, do more research and/or get a second opinion. When my Daisy (6 yrs old) had a lump, the diagnosis only fit about 80% of the symptoms. Even on the day she died, there was something that didn't make sense. Now, with that old 20/20 hindsight, I truly wonder if we had the right information. We will never know.

Don't hesitate to ask questions for your beloved fur friend!