I went out to feed Goose-Goose. He's a canadian goose that we raised. We live in MN. His balance is off, he's lethargic, with trouble walking. Kind of flaps his wings and falls. He has not been not eating much this week. He has always gone through periods of not eating much, then eating like crazy. I feed him cracked corn and all flock pellets. He has diarrhea. He was doing fine up until the last cold snap started this week. His breathing is a little raspy, and he has no energy. Any suggestions? My vets know nothing about birds.