What does it mean when a Cat PANT like a hyper Dog?

I've never seen this happened before with my and my family's cats (had five, lives on a country side), especially didn't expect this on a cat that has been almost MUTE for ten years. All he does is chirping and purring, but when we took him to the vet in a cat, he behaved like a curious dog with his... show more I've never seen this happened before with my and my family's cats (had five, lives on a country side), especially didn't expect this on a cat that has been almost MUTE for ten years. All he does is chirping and purring, but when we took him to the vet in a cat, he behaved like a curious dog with his mouth wide open. I'm not sure if he was just scared of the car, but he was got rather hyper and started meowing for minutes. Our other cat's doesn't do this, they just meow loudly.
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