First off, it's good that your dog is use to living with cats and kittens as these should make it easier for your kitten to accept the dog.
I don't blame him for being scared right now as your dog must look HUGE to him right now.
Just take it slow with the intro's and the kitten will get use to having the dog around, but, and I'm sure you know these already, never leave them alone without any supervision, until the kitten is okay with the dog.

Good luck and keep us posted on how it goes.