Our 10 year old spaniel/New Foundland mix is overweight, and we started walking her. Two weeks ago after walking, she never stopped panting, and has been panting ever since. The only time she doesnt pant is when she lies with her head flat between her paws. Initially an urinalysis, thyroid profile, lab profile(CBC), lab profile (gen diag) were done. Then chest x-rays were done, and Prednisone, Ciprofloxacin, and Aminophyline perscribed. All these medications were stopped by the vet at intervals as she didnt improve. Then x-rays (additional views) were done, and then Urine cortisol ratio, ultrasound thorax and ultrasound abdomen. Finally an ATCH stim test was done, and all came back normal. Initally she drank a lot of water, but this has slowed down. She eats well, and doesnt appear to be in pain. We are desperate, she pants so loudly that she wakes us up at night, even while sleeping in another room - can you please help? Thank you.