What could be the cause? And if its something to worry about how can I fix it? One of my 10 week old silkies is breathing heavily, with its mouth open and lifting its head when it does it. He doesn't seem to have any other issues. He is eating and drinking, walking around with the others in the pen. But he just keeps breathing hard like this. I checked for a smelly odor coming from his mouth or nose and there was nothing out of the norm. And he hasn't showed any signs of snot yet.