Hey there, I have 10 chickens. A few days after getting them a couple started coughing & sneezing. Went to vets & got denagard, for the whole flock. They are on their last day of the 7 day course. The 2 sick ones have only shown the slightest of improvements & now 2 more have started coughing & sneezing :-( I still have a couple more doses of denagard in the bottle, should I give til it's all gone? Or should I take one of the new sick ones to the vet? Any advice would be greatly appreciated x