I have a beautiful 7yo Springer Spaniel, who seemed in good health until a few days ago when I noticed that her mouth was open and her tongue was hanging out a little bit. I'd given her a piece of salmon skin at lunch time, and she'd failed to chew it; just taken it down in one piece which was about 6cm x 115cm. That evening at 5pm her breathing was loud and sounded as though something was obstructing it, and her mouth was open, with tongue out. I assumed the salmon skin was stuck, so gave her some dry biscuits to try and dislodge it, but to no avail. We went to the vet first thing next morning.
They had a look but couldn't see so they gave her an anaesthetic and tried again, and also X-rayed her. They were unable to find any obstruction or swelling. She is on a course of antibiotics and anti-inflammatories, and the vet said that in the back of his mind he is considering the possibility of Myasthenia Gravis. It seems as though she can't keep her tongue in her mouth or control her lower jaw. If anyone has any clues, I'd be very grateful.