A month ago I noticed my 7 month old sussex hen sneezing. I kept an eye on her and the other hens and she seemed to be the only one sneezing. I thought it could be the coop so I'm in the process of building a bigger one. My hens are free range during the day and locked in at night. Today I noticed that when she breathes she's very noisy. Not really a wheezing sound. She kinda sounds like a duck or a deep bok bok sound. I have her separated and am going to take her to the vets tomorrow. I've put wormer in her water just in case but I only wormed them a bit over a month ago. Any one have any ideas what it could be? I heard chickens can get pneumonia or something. It's been really hot where I am at the moment so I also thought it could be because of that?