Sounds like extra fluid. My feline leukemia positive cat was belly breathing about 50 times a minute. I rushed him to the vet who said he had a hemo thorax and removed 200ml frothy blood. He had a tumor that was leaking and compressing lungs. He layed stretched out or up on his elbows. If your cat is belly breathing and breathing upwards of >30 minute-run to the vet! Sadly I put my baby to sleep that day. I had another cat with CHF (congestive heart failure) was treatable with meds. SHe lived a year.
The Maine Coon, one of the oldest in North America, was first discovered in Maine, where it is the official state feline. According to the International Cat Association (TICA), they are known and liked for their intelligence, friendliness and good-natured goofiness. (Fetch? Heck yeah!) They prefer to hang with their people versus being coddled by them.
The Russian blue is a sweet-tempered, loyal cat who will follow her owner everywhere, so don't be surprised if she greets you at the front door! While she has a tendency to attach to one pet parent in particular, she demonstrates affection with her whole family and demands it in return. It's said that Russian blues train their owners rather than the owners training them, a legend that's been proven true time and again.