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Hi this is Dr. Hill . Please take a look at Rosie's gums and tell me what color they are.
Has Rosie ever been diagnosed with a heart murmur?
when did the heavy breathing start. Has she had any other issues? Weight loss or gain? appetite change? Any skin problems? Are you able to check her temperature rectally?
An increase in respiratory effort or rate can be due to several different medical issues. In an older dog, heart disease, lung disease, Cushings ds, cancer or pain are all possibilities. Heart disease can cause an increase in respirations due to fluid build up in the lungs or anxiety associated with an arrhythmia. Lung diseases (bronchitis, pneumonia, hw disease) may show up as a cough of increased effort to breath. Cushing's disease causes increased respiration due to anxiety associated with the body making more steroid than normal. Since there are a number of possibilities for why Rosie is breathing heavier than normal, the best starting point would be with a good physical exam and X-rays of her lungs. Do you have a local veterinarian?
you definitely need to take him back to your vet for chest X-rays. There are medications they can put him on to help him breath more comfortably.