I am long term sitting a dog, I know the dog very well and it knows me iyswim. Dog has stayed before and has met cat lots of times. But it was not long term before it was a week or 2 at most or a day visit
Cat is a house cat who doesn’t go further than the garden. Cat and dog are similar size
Cat and dog don’t fight or anything at all but they don’t understand each other’s body language so they make each other jump a lot ie the cat is slinky and sneaky and makes the dog jump when cat comes out of nowhere 😂, dog is bouncy and playful and makes the cat jump and very much 
Dog can be jealous of any attention cat gets but there is rarely hissing or spitting or physical touching so I am not too worried it’s negative. Does this sound like it has good potential?
I just would like some good advice how to integrate them well to live together so neither become unhappy although I am not sure they will ever be close friends. I don’t want my cat to be unhappy
The dog is much more interested in cat than the other way round but they will sniff at each other. Cat tends to enjoy subtly positioning itself to block dogs way through doors too 😂 and occasionally the dog will go into ‘chase’ mode and there is a minor scuffle/stand off is this pretty normal stuff?