He's been that way for a month. We treated with Draxxine at first. He seemed to improve slightly but still seems to struggle with breathing. He seems to be taking deep breathes like he just can't quite get his lungs filled. He is full of be nice and vinegar when I rope him. But the panting, tongue hanging out, and hard breathing is a concern. We are at higher altitude (5900 feet); could that be an issue? He was born on the property and mom is well adapted. It has been fairly good weather, we had a little bit of rain -- 3" worth--a couple of weeks ago but he was in the pasture most of time.