Actually what you are seeing are the different color phases of a Bobcat. During the winter months, they are brown or brown grey. That is why Boris looks grey in the center picture, that was taken during the winter. All 3 are now orange or a brown/orange mix. Nakoma has the most orange on him as does Amber. Boris, since he is still a kitten, just a little over a year old, he still has a combination of orange and brown. Next summer he will be more orange.
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. 
If Mya started panting after playing suddenly, that may be a sign that something might be wrong. If is has been hotter than normal, and suddenly, that might explain the panting. It is difficult to say without the ultrasound whether she has a problem or not, unfortunately. She seems quite healthy otherwise, but if the panting is a dramatic change, having the ultrasound will let you know what is going on with her.
There are several possible ways cats can develop pyothorax. In many cases, the initial cause may remain undetermined. Some causes include bite wounds, trauma, inhalation of an object such as a grass awn, bacteria ascending from the mouth, diffusion of bacterial infection, parasitic migration, perioperative aspiration, tumours, ruptured abscess and lung lobe torsion.
Without examining Tilly I cannot say for certain whether I would recommend euthanasia or not; but if she is struggling to breathe, seems in pain and your Veterinarian hasn’t recommended any surgical options (due to age or location of tumour) then you may want to think about euthanasia. It is a very difficult decision to make, but you need to look at Tilly’s quality of life and what the future holds for her. Regards Dr Callum Turner DVM
The Russian Blue is robust, marked by strong sinews, a velvety fur and fine outlines. This breed is closely related to 3 other cat breeds, namely the British Blue (or the British Shorthair), the French Chartreux and Thailand Korat because they share the same hue and have short hair, but the similarity ends there. Each of the aforementioned blue breeds have their own fun personality and coat characteristics.
My kitten has been in and out of the vet's office and is on strong antibiotics and oxygen since Oct. 26 until now and he is getting better for a few days and he is right back at it. He has spent a lot of time at the vet and the bill is getting high. He is home and I am giving him the antibiotics and oxygen at home and it does not seem to be helping here. But at the vet he does good after a day or two. How much oxygen do I give him at home and how often?
My cat had an leg amputation two days ago, he recoverd fine and this morning he was walking in the house, eating and using the sand box. Suddenly this afternoon he began to act very strange he began breathing heavily and a few hours ago he started to wheeze and he wants to vomit but nothing comes out. I am really worried I did phone my vet she said it is normal for them to experience great pain. He received tolfedine for pain to be taken in the mornings, could it be the pain medication has wornbeen off and he is experiencing pain or is it something else?
It is possible that Milu is breathing rapidly due to pain, falling from that height may have left Milu with some permanent injury which occasionally causes some pain; however without examining him I cannot say with any certainty. You should continue to monitor him and look out for any other symptoms, but any head trauma may present with issue later on in life. Regards Dr Callum Turner DVM
Rapid breathing (tachypnea) is a respiratory disorder characterised by abnormal breathing that is rapid and shallow. It is caused by a reduced level of oxygen, mechanical disorders (where the lungs aren’t able to expand as they should, usually due to a build-up of fluid in or around the lungs), and physiological disorders in which the cat’s respiratory centre in the brain is over stimulated.