I have a brown Chinese goose that keeps falling over. She is 5 months old and this just started suddenly a few days ago. Her legs seem a little swollen... and she will walk fine for a while, then fall over onto her back and is unable to right herself. She is eating and drinking fine, pooping fine also. She will wander with the other 3 geese, but after a little while just falls over. I’ve also noticed her wings are shaky when she stretches them out. I recently changed their food over to a better pellet... All Flock. I brought her in for a few days and gave her some electrolytes in water in case it was overheating. But I can’t tell a difference. I let her out again today with the others and have had to turn her upright a few times.... anyone have any suggestions of what is causing this in only one goose? Treatments?