We seems to have a goose with some issues that have been climaxing over the course of a week. He's very UNSTEADY on his feet, can only really walk in a circle to the left and then falls over. Can't get himself up on his own, is very dirty bc he cannot clean himself, and I feel totally bad for him. We've been feeding our geese layer crumbles (which are for geese) and they also free range during the day. The feed has niacin supplement in it, as from past research we thought that maybe it was Vit B deficiency. I've ordered nutritional yeast, but am still waiting for it in the mail. Do you know what could be wrong? Should we take him to the vet? Any suggestions?