5 year old golden retriever, hypothyroidism, weight under control, taking soloxine. Wonderful girl, but can go to bed at night totally relaxed, and begin panting which goes on and on and on. Then finally a big breath, sigh, and it ends. So worried. She begins panting for no apparant reason...it's cool inside, and she's at rest. Help!
It is probably because she is overweight. vetcare