I have a hen that was attacked by our dog when it got into the yard where the dogs run and have been rehabbing her in our 3 season room. After giving her some food & water, I washed my hands, and was sitting in a chair. It kept feeling like something was crawling on my face. I looked in the mirror, & had a tiny little bug crawling. Eww. After doing some research, thinking it may be mites. I then went out & was looking at a few of the other hens, around the vents, & there was a small black bug. But it is much bigger than the ones on the other hen. How do I determine either is a mite? And do they cause feather loss?