I had a wonderful little white leghorn. She was about two 1/2 years old. Laid beautiful eggs almost daily even in Winter. Fed with flock raiser and free range. About three weeks ago, she became slightly lethargic and stopped laying. I checked her for egg binding and she was not. Her crop was fine. She never stopped eating and drinking. She became progressively weaker and more lethargic. I treated her for worms because she became very thin. She never stopped eating and drinking. Last three days I lifted her into the coop at night. (Couldn't bring myself to kill her and she never stopped eating and drinking; just got weak) She finally passed away last night. Do chickens get cancer?