Is my dog having nightmares?

My dog is getting old. He's about 9 now. Sometimes he naps during the day and then he starts breathing really really heavy like he's panicking? And he's almost whining. Then he starts flinching his legs. It happens often. Is he having nightmares? Does he have PTSD? He's only small and he's got... show more My dog is getting old. He's about 9 now. Sometimes he naps during the day and then he starts breathing really really heavy like he's panicking? And he's almost whining. Then he starts flinching his legs. It happens often. Is he having nightmares? Does he have PTSD? He's only small and he's got attacked twice by dogs triple his size. Is it something else? Anything I can do?
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