Glad to see the squirrel is recovering. Just a thought, have you tried Pycnogenol?
In this study. despite the drop in estrogen that is a key factor in Calcium absorption, PYC inhibited bone loss in rats. With normal hormone levels, be a rodent male or female, it supports bone density.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4565266/
https://www.amazon.com/Healthy-Orgin...5&s=hpc&sr=1-4
Healthy Origins 30 mg. capsule divided into 16 parts give to parts daily with yogurt or wet food.