I was advised by a rehabber to use, 'Arnica montana' homeopathic remedy for muscle damage for a our yard squirrel's injured arm. The Squirrel fully recovered.
For potential broken bones, adding a bit of calcium citrate powder ("Pure Bulk") onto a separate nut misted with water, lends support to bone healing.
Arnica 30 C by, "Borion"; available on Amazon and other stores that carry vitamins.
https://www.amazon.com/Boiron-Montan...1&s=hpc&sr=1-8
Calcium Citrate Powder; third party tested USA:
https://purebulk.com/products/calciu...SAAEgJ5-vD_BwE