That,s good news. You know now that he is ok. Try to feed him rats instead of mice. Maybe he will refuse at first but he will eat at the end. Mice are too small for 3 year old BCI. Feed bigger size meal and less frequent. My 18 months old male BCI ate last time a live jumbo rat (411 grams). I,m telling you this so you can have an idea what BCI,s are capable of. I,m sure that your BCI can take medium rats.