There's a definite behavioral improvement since Elvis has been off the Vetmedin for 24 hours.
I talked to the clinic, though the vet was so swamped I didn't get a chance to speak with her. What I've decided to do is to cut him back from 2 pills/day to one pill. That will mean a half in the morning and a half with dinner. His Lasix will remain the same and, if possible, his cough tablet.
I'm hoping to start the new routine in the morning with his breakfast, but a lot will depend on how he acts when I come through the gate in the morning. If he's panting and wagging his stump and grinning, I'll go ahead and start it. If not, I will wait until dinner tomorrow night. I've got to get enough of a normal behavior started so I can tell if he's reacting poorly to the new dosage.
We're keeping our fingers crossed because the medicine does help him, but there's no way we can deal with the behavior changes. They're not good for him or us.