I lost one of my silkies over a year ago, she kept falling over, would put one leg in front of the other, lost weight and passed away. 8 months later I lost her sister, she became lethargic, wouldnt come out, started having labored breathing and died. I did have a problem with lice at the time. Them two silkies were with 4 buff orphingtons and a bantam silkie all them are fine and haven't been vaccinated. I got a new pen and brought 7 more silkies, i put my bantam silkie in with them. I've had my new ones since April and now one of the new ones is falling over, tucking her neck in and losing weight. Could it be mareks passed on by either buffs or my bantam silkie? I don't think the bantam silkie has been vaccinated either but I've had her a year and a half with no problems. I have pics of all three, the first two have passed away.