My Merlin went to the Bridge very nearly 10 years ago, and I know things have changed drastically since then, but constipation, I know, is a side effect of kidney insufficiency. When I realized that had happened with Merlin, we were not at home, so I went to the grocery store and bought some baby suppositories, and that seemed to help. No doubt your vet has better solutions, but it might be something to keep in mind.

Prayers for Tama's continued improvement.