Hello all knowledgable chicken parents! I have been referring to this site for about 7 months now, that's when I became a mom to 3 silkie hens. My friend didn't want them anymore so I jumped in! I've done lots and lots of research, and still feel like I don't know enough. So today I decided to join Backyard Chickens so I can get the expert info I need. My girls are Gertrude, Agnus and Foxy. I believe they're about 2 yrs old. About a month after I got them a friend of mine offered me her young rooster she was wanting to rehome. I took him in and the girls and I fell in love! Agnus followed Marley, the rooster, everywhere and he showed the girls how to be free range chickens. All was great until about 2 weeks ago when I noticed Marley walking funny. I repeatedly checked his feet and legs, cut his nails but nothing helped. Then he started falling to one side. Well I brought him inside to keep him safe and warm and googled everything. Long story short, I took him to the vet where he was diagnosed with Merek's disease. I had him put down because I couldn't let him suffer. The vet said I could vaccinate the girls but if they were infected it wouldn't save them. So far the girls are great, knock wood! Well except Agnus, she really misses Marley. So, I was going to vaccinate for Merek's just in case. What else should I vaccinate for? Or shouldn't I vaccinate adult birds? My sister has a Cochin rooster that she rescued and offered him to me. I read that Cochins can get to 9 lbs, my girls are 2-3 lbs...would he be too big for them? I don't want my girls to get hurt. I could vaccinate him too, if that's suggested. Oh what to do??? Ok so who has some great advice?? Please help. Thank you all sooo much!