Help please! I was letting the pigeons out of their loft today, when I noticed one of them sitting near the cage all puffed up. My dog sniffed it, and it didn't even move. I picked it up, and felt its crop. It was empty, except for a ring like object right in the middle. It feels almost like the ring around the neck of a gallon milk jug. How do I save her? She is laying out flat now, and it looks like time is running out. I got her to drink some water, but it only seemed to make it worse. Please help, any suggestions would be appriciated! Thank you!