I have a red Texan cornsnake that is about 14 years old that has regurgitated his last 8 mice. He takes them quite readily but after 2-3 days we find a part digested mouse in the bottom of the tank. We have adjusted the humidity and the temperature but this has not altered anything. He is still active and regularly drinks water and produces a clean "all in one" shed. A vet will just force feed him and that is not what is needed.

Any advice would be appreciated.