I have been thinking about Carter since last night when I read your post. I couldn't wait for an update, and I was so happy when I got to your first post...and of course, so sad when I read the next one. Poor little guy! I am so sorry to hear what happened to little Carter. As the others have said, it truly is an unfortunate accident. They can happen so easily. I'm sending my thoughts and prayers to you and your family. Your poor son...we grow to love our little Yorkies so quickly - they are just bundles of joy! I'm sorry for the pain you are going through.
I do hope something can be done about or said to that first vet. How could someone who has chosen this profession ignore an emergency like that?