He probably swallowed a bunch too fast, not an allergic reaction but it gets stuck or " stored " in their throat pouch.Hey everyone just something that happed last night… I have given hades some kale for the first time he ate it all in 5 minutes. I went downstairs, when I came back up he has stress lines all over him and his neck was swollen. I took him out and he calmed down but his neck was still swollen. I let him sleep outside his cage and I stayed with him for a bit. But in the morning he was normal. Was it like an allergic reaction?
And you don't have to worry about impaction from substrate, just don't use crushed walnut [ it can cut them up inside, very sharp ] or calcium based " sand" [ can turn like cement consistency in their digestive tract ]