Hello, I am babysitting my friend's duckling who we got for him on his birthday. Just yesterday he started falling over and having trouble walking. I thought it might be a leg or tail injury but both are scratch-less and don't appear injured. He is a 2 month + old Silver Appleyard Call Duckling, still a young duck. His name is Senor Archibaldo de Pato, Mr. Duck for short. He lives alone. I'm really worried about him. He is still eating and drinking but his poop is appearing more liquid green/white than solid lately. His neck is crooked a bit and he shakes his head a lot more. He also sneezes from time to time. He has a lot of trouble walking, but he's still trying, and mostly just leans on his tail which he bends for balance or the side of the tub I have him in. I thought it might of had something to do with his living in shavings (as instructed by the woman we bought him from) so I now have him in a fairly spacious tub with blankets under him. I'm changing them out like a mad woman so he isn't prone to being in his own feces. He falls onto his back and flails a lot, especially when he tries to groom himself. From what I've researched he fits the symptoms of Riemerella anatipestifer Infection or "New Duck Disease" most closely. I'm not 100% positive though. I bought him for $15 and don't really have enough money to bring him to a vet. I'm going out to a local pet feed store to buy Penicillin which I believe will help him if I can get him a proper dosage. Any Advice?