One of my 4 Rhodies has gained an enormous amount of weight over the past month.I have even monitored her food intake and the weight keeps coming. She is not interested in grazing when in the backyard.Today,I found her on the floor of the coop unable to move.She keeps shutting her eyes and feels slightly cold.The coop is rodent proof,but we have had rodents outside...we live in the bush. I am thinking she has had or is in heart failure. The weather here is currently very mild.WE thought she might have been bullying the other chickens out of their food,but she has been watched and still gaining weight.When I handle her,she feels "lumpy" under the breast area,but we thought it was excess fat. We are about to take her to a vet who knows NOTHING about chickens....we have no idea how old she is as we inherited her when the previous owners sold us the house 2 years ago. I personally think she has a hormone problem - do chickens have thyroid glands? - and the weight has been too much for her heart. Can someone please advise?