I have a rooster that is nearly 9.5 years old. For a couple months, he has had a limp. Then a few weeks ago, I noticed he seemed to have slightly droopy wings, though I kind of wondered if I was imagining that or not. Then he started sitting more. Not unexpected due to his limp and age. Then he started sitting nearly all the time and having a hard time walking, so I would bring the food and water to him and put him in the coop at night. Well, for about the past week he can’t walk more than 2 steps and sinks right back down and his head lays on the ground. All I can get him to eat is basically water and milk. He now seems to have a hard time swallowing. He drinks some milk and then kind of seems like he is choking on it. Initially I came to terms with thinking he would pass away from this after a day or two and figure it was just old age and nothing I could do. But, since he is hanging on for so long, I have hope that maybe I can fix this? But I have no idea what to do. I gave him a day of antibiotics early on, but he seemed worse the next day and therefore I decided not to put him through that figuring he would not last the day. I checked for mites and dusted him with DE, but that doesn’t seem to be the issue either. Also, his poo is bright green. I also have two other hens the same age that seem perfectly fine. Any ideas? Please help me save my rooster.