my tortois die

by Hilda Magallanes
(Fontana, Ca)

my tortoise had a shell problem from the day i purchase it in a pet shop in Chino,Ca I had it for 5 years it was about 45lb and with time little by little the back of the shell started sinking in, it look fine and all of a sudden my tortoise is dead, Now i don't know what to do to it where should I take it and why it die