Wow, I didn't realize Roxy had MVD...She definitely should not be on phenobarbitol then...It's sooo taxing on the liver. Potassium bromide is what they recommend for liver compromised dogs...Is she taking any supplements like sam-e(denosyl) or milk thistle. These will really help her liver. Does she take lactulose? Lactulose is key in helping a dog with liver disease. You definitely need a vet who is experienced with this kind of liver disease.
Please join this group on yahoo groups...
http://pets.groups.yahoo.com/group/L...d_MVD_Support/
They have a TON of information in their files section and the members are extremely knowledgable.