I've been breeding and raising white, pied, and ringneck doves for the past 7 years. It seems that every time a problem is fixed, a new problem comes up a few months later. In my 7 years of breeding, I've never had an issue of disease with my doves. There was a time when they had some kind of parasite in their feathers, but that was taken care of long ago. Otherwise, all the deaths that have occurred with my doves where either due to wild animals or, in the very very beginning, when I didn't have a good brand of dove seed. Today I found one of my white doves dead. She was one of my older doves, anywhere from 5-7 years old(I wasn't documenting exact age when I got her), but even then doves typically die naturally at around 12-15 years old. She had been a breeding dove up until a few months ago when I decided to retire from breeding them, so that likely shaved off a few years of her lifespan, but she was still pretty young. Good weight, no missing feathers, healthy appetite. No noticeable signs of disease, her eyes were clear. I even looked for any abnormal looking feces, but I came up with nothing. Is there anything I might be missing that I could look at for any signs of disease? I'm suppose to be giving around 7 of my young doves to a family member of mine soon and all my doves are in one cage. I don't want to give sick doves to anybody. I'm also planning on getting a couple of pheasants and perhaps a quail to add into the aviary with the doves in a few weeks, so if there is a disease I need to find and treat it now.