That’s not surprising that only your husband has seen him stumble then, birds hide sickness until they can’t anymore, and it’s pretty dire at that point, they only show their symptoms to those they completely trust before that.
Goose droppings normally look like little brown or green logs with a white cap
Like this
View attachment 2738486
Every few droppings they’ll produce what’s called a cacal poo which is pretty much a pile of dark green or dark brown pudding that smells horrendous, it’s normal.
If they’re eating a lot of watery foods like cucumber, fruit, or melons or they’ve been drinking a lot of water on a hot day the droppings can be really wet runny puddles.
If the droppings are consistently runny for days it can be a sign of GI upset, if there’s undigested food it could be because of worms, coccidia, or an infection.
If they’re black it’s bleeding in the upper gi, red if it’s bleeding in the lower gi, neon green if it’s lead poisoning or emaciation.
The white part is urates, which should always be white or creamy/off white. If theyRe yellow or green it can indicate a severe issue with the kidneys or liver.