2 of my chickens died 2 days ago cause of someones dog jumping in my yard. I bought 3 2 week old silkies and from another breeder 2 8 week old pekins chicks. 1 of them has a strange odour to her nostrils and has lost a small amount of discharge from her nose not much though. No sneezing or snuffals. Her crop is empty but is trying to eat. She did have some meal worms though. She appears active enough. She is drinking well. I have added acv to her water. She appears to be gasping. She ststches out her neck and her mouth opens wide. Cannot feel any blockage. I cant even feel her crop. She is being feed medicated chick starter. If she has corya do I have to kill all my birds. She has been about 3 metres from my 2 remaining silkies from the dog kill. She has been in with the silkies I bought with her as well as the other pekin. I have never killed anything before.