My sick silkie died a few days ago after I treated it with Sulmet, and then I noticed that my white japanese bantam was breathing heavily but otherwise acting normal. So I decided to treat all of my chickens with the Sulmet. That was a few days ago and the treatment was over. Today I found my white japanese dead. Her symptoms never escalated anymore than the heavy breathing and I didn't even see her doing that after the treatment. It's been raining a lot lately and so my chickens all look a little bit different and so I can't tell if they're sick looking or not. I'm very frustrated because I know a lot of people that keep chickens and none of them put the effort into their chickens that I put into mine. And they haven't had nearly as many problems as I've had. I've lost 4 chickens out of 14. And my andalusian is acting weird too. She doesn't look sick but I've noticed from every animal species that I've kept that acting differently than normal is generally not a good thing. Any thoughts on what I should do? Thanks.