I wonder why they started her on KBr first rather than phenobarb. KBr has a VERY long half life and you can only change blood levels very slowly. Also, when a dog is on KBr you have to be careful to keep salt intake constant, since the chloride competes with the bromide. Changes if food have to be thought out and done carefully, and treats done very carefully. In know there is some risk of liver damage with phenobarbital, but it can be minimized with monitoring and the use of milk thistle and Sam-E. And you can change blood levels pretty quickly, as well as give a little additional phenobarb if you're worried about a cluster. Can't do that at all with KBr.