i have about 10 silkies that are all sick a few are worse than others a few have white mucous build up in their eyes and most of them are sneezing half are coughing and a couple have rattling sounds when breathing ive been using a cicline antibiotic for five days with no improvment i have been giving them vitamins in there water and put them on some of my starter grower that is 23% but they arent getting better any ideas on what to do next