Cat Open Mouth Breathing Stress. The first thing is to remove the stressor and see if she gets better soon. Not only can it exacerbate existing physical conditions, but it can lead to a number of problems often considered behavioral, such as litter box avoidance, aggressive behavior, or depression and withdrawal.
If your cat stops breathing, start cpr and contact your vet straight away. However, the appearance is the same. While a panting cat is rare compared to panting dogs, cats may pant when they feel hot or overheated, after active playtime or exercise, or when they are stressed or anxious.
If a cat is breathing through the mouth, especially heavily, pay attention.
When to see a veterinarian about cat panting. Their rate of breathing may be noticeably rapid, for example. Several medical conditions can make a cat’s nose partially or totally blocked, to the point of forcing the animal to breathe through its mouth. The first thing is to remove the stressor and see if she gets better soon.