If no amelioration appears in three days, it means is no canker and is useless to continue the metro treatment.superflyer, the flagyl or metro should be given for at least 7 days it really is not good to jump from one med to another without giving for a full course first.
You really do need to research more before giving advice to others. Often it takes much longer before you see improvement. I have no idea where you get your 3 day idea. But it can take 2 weeks to cure a bird of canker. And the same goes for bacterial issues.By switching around on and off meds, you mess with his system, weaken the bird, and aren't curing anything. If you start a treatment, you finish it.If no amelioration appears in three days, it means is no canker and is useless to continue the metro treatment.
I would say: give metro for three days and if things don't start to improve, stop the metro course and give antibiotics for another three days. If neither after antibiotics things don't start to change, it means is neither canker or bacterial.
That shows that he feels something in his crop or neck that he wants to throw out. Might be a canker nodule but as well an object stuck in proventriculus. Have you tried to feel through the crop if he has some nodule on neck or in crop? Try to feel the hollow of the proventriculus in the lower part of the crop. If you don't feel the hollow, might be blocked with a nodule or solid object.His main syptom is craining the neck way far out then shaking quite a bit very forcefully
trying to vomit. He has passed water so he cannot be tottally blocked. He continues not eating.
Canker is of two kinds:I think it may be internal canker as described by Dr. Colin Walker.
Is the kind of green that appears in your photo? Or in the meanwhile it turned to a bright green, in which case it means your bird is starving and that is more dangerous than any parasite. You have to forcedly feed him with wnough quantity of food.The green poop could have been due to the canker .
That is possibly Candida, which is a white fungus (the scientifical name comes from a Latin word, candida meaning "white") and which may well explain his symptoms. Or again, it can be canker.I reported earlier that I thought I saw a whitish spot way down his throat by I have not seen anything like that again and it may have just been saliva.
Are you refering to the vomiting or perhaps to the aspect of dropping? Are you sure it can't be something else?This bird is showing classic signs of canker
Or better make some lab tests, if possible. I agree that in most cases is canker or bacteria, but yet can be Candida or stuck object.If you want to try and cover most things, then give a good canker drug, and a good wide spectrum antibiotic for the 10 days.