Cosmo is continuing to use his leg a bit more each day. I have researched braces and decided to order one from Orthopets
http://www.orthopets.com/
While they are pricey ($575+) I believe it will give Cosmo the stability to be a bit more active, while still recovering from his injury. We like the idea that the brace is custom made to fit Cosmo's leg, instead of an ill fitting generic brace.
The first step is we are ordering a casting kit so we can cast his leg.