noise

I have a three year old deer, has not been eating and very thin, has now started to have green mucas running from noise, any advise appreciated, stool are also loose.

hey, dumb question... Jeffrey has been loose for 7 days (he is 16 wks old) and all seems to be well except today when he came off the hill and I was giving him a small bottle of red cap (he had been looking thin since he has been free) and when I offered the nipple he made his baby noise...