This is about my cat named eren. He was fine when he was a kitten other than being feral and not used to people. But about two months ago, he started doing this thing where he is breathing fine and all one minute and the next it sounds like his breath is coming out in quick bursts almost like coughing. And it always goes for about 8 or so bursts of breath. Is this something I should take him to the vet about
My cat isn't eating his treats which is VERY unusual for him. He's sitting like he's uncomfortable or ready to dash. He's also making a very weird, low noise almost like an attempt at a growl or purr but it isn't quite there. I also noticed he is breathing rather quickly. The article I read here said 20-30 breaths a minute and it looks like he's doing 40 in 30 seconds. His gums don't look pale or blue. Just the normal pink. His nose is still cold too. I haven't seen blood anywhere on him or in his litter box. It also seems like he hasn't vomited at all either.
Pulmonary edema is the buildup of fluid in the within these air sacs leading to shortness of breath. Located in the lungs are thousands of air sacs (alveoli) which are small balloon-like structures where the exchange of carbon dioxide and oxygen occurs. Tiny capillaries surround the alveoli on the outside. When the cat breathes in, air enters the lungs, causing the alveoli to expand. Oxygen passes from the alveoli and into the capillaries, carbon dioxide from the capillaries pass into the alveoli and is exhaled out. The most common causes of pulmonary edema relate to problems with the heart, such as hypertrophic cardiomyopathy. Heart diseases can lead to reduced movement of blood through the capillaries in the lungs. As the blood flow slows, fluid leaks out of the vessels into the airways. 
A loss of appetite and lethargy are both vague symptoms but the rapid breathing is concerning, you should visit your Veterinarian for an examination as rapid breathing may be associated with pain, anaemia, heart disease among many other conditions. Without examining Ozzy I cannot determine the specific underlying cause of the symptoms and would recommend that a visit to your Veterinarian be made before the weekend. Regards Dr Callum Turner DVM
To know for sure you’ll need to see the pedigree and your cat should have been registered with a cat association. A pedigree is a family tree going back four years or more that contains the full names of the cats, all of which should be Russian Blues or cat breeds that are approved for breeding Russian Blues by the cat association. That sounds awfully complicated but all purebred cat cats are registered in that way in the West (Europe and North America). There are a number of cat associations. Hope this helps.
Pyothorax (pleural empyema) is the presence of pus in the pleural space in the chest cavity, the thin, fluid-filled space that lies between the lungs and the chest wall. Any pathogenic organism can cause pyothorax including fungal, viral, bacterial or protozoal; however, a bacterial infection is by far the most common pathogen. The collection of pus is due to dead white blood cells and dead bacteria. Common bacteria involved in pyothorax include Pasteurella spp (the most common), Nocardia spp, Streptococcus spp, Clostridium spp, Proteus spp, Bacteroides spp and Mycoplasma spp.
Lethargy and increased respiratory rate are not specific symptoms as they are shared with many conditions; however I’m concerned that they are a common sign that an animal is in pain, but without examining Marilyn I cannot say whether she is in pain or there is another cause for the symptoms. You should visit your Veterinarian for an examination to be on the safe side especially if this has been going on for a day or more. Regards Dr Callum Turner DVM