A cat may have rapid breathing for a variety of different reasons which may include infections, pain, high temperature (to cool down), heart failure among other causes; if your Veterinarian was unable to identify a cause, you should keep a close eye on Skittle and see if there is anything which occurs before an episode as it may be a reaction to anxiety from something. Regards Dr Callum Turner DVM
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
Chausies are bred to be medium to large in size, as compared to traditional domestic breeds.[5] Most Chausies are a little smaller than a male Maine Coon, for example, but larger than a Siamese. Adult Chausie males typically weigh 15 to 25 pounds.[6][7] Adult females are usually 15 to 20 pounds.[6] However, because Chausies are built for running and jumping, they are long-bodied and leggy with medium boning.[1] The torso is deep-chested with flat sides. The ears are broad, tall, and set high on the head, about two fingers apart. The cheekbones are striking—prominent, long, and angular—and the eyes are flattened on top and form a half oval below.
It is difficult to say whether this is something pathological or not since the rapid breathing for a short period of time may be due to smelling something (looks like breathing with the chest movements) or another cause; if there are no other symptoms and these ‘episodes’ only last a couple of seconds I would keep an eye on things for now and bring it up with your Veterinarian at Salem’s next checkup. Regards Dr Callum Turner DVM
For instance, the liger’s increased growth rate and enormous size can cause the tigress giving birth to have a difficult delivery, endangering both the mother and her liger cubs, which may be born prematurely or require a Caesarian. Common problems in cubs that survive are neurological disorders, obesity, genetic defects, and a shortened lifespan; though a few have reportedly made it to their twenties, many don’t survive past the age of seven.

My fiance said the he saw her eat this afternoon, so that is a relief. Her gums are pink (that's one of the first things I looked at on her and I should've told you that...but... this is my BABY CAT and she has me a little panicked!.. not like dealing with humans on the ambulance... she's innocent!) I do have access to oxygen... so we can make her an oxygen tent if it's necessary. Right now, she is getting up every couple of minutes and repositioning or pacing.. her respiration rate is around 50 right now... her belly almost looks like it's spasming and her heart rate is running between 80 and 90 everytime we take it... which is low... what do you suggest?????? 
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