Hi Gee-
We just had a Westie come in to my clinic yesterday that one of the main concerns the owner had was excessive panting. She ended up having a splenic tumor which we had to remove. Have you had an ultrasound done or only chest x-rays? Also is your dog overweight? I’ve seen more overweight Corgis than fit Corgis unfortunetly and being overweight for that breed (any breed though) is extremely dangerous. The panting could be caused by that as well.
Also how long have you been giving the Merrick treats and did the panting occur around the time you got the last effected batch or way before then?
