Mini update: Last test came back: PB levels were good. So we are continuing to do 1/2 doses twice a day plus 1 Sam E supplement per day, to help his liver break down the phenobarbital. Jasper's seizures have been milder and his symptoms much more manageable. At this point he will be retested in 30 days for both the PB and Liver function plus the enzymes, but for now all is good and we are breathing a sigh of relief. We know we are not out of the woods yet, and the the liver enzyme levels will vary quite a bit with each re-test for a while due to the PB, but hopefully with the next round of blood work we will have a set of numbers that we can use as a basis for future tests. Fingers crossed on that. My hope is that Jasper remains stable as far as the epilepsy is concerned and that we can keep him on the low doses of pb because it is a tough drug for any dogs system especially with long term use.
Jasper holding on to his daddy for dear life while awaiting his blood work to be done:

Could be daddy holding on to Jasper for dear life to....neither one does well at the vet's office.