How about training the cats?

Show them places that they can get out of the pups way, put comfy pillows for them to sleep on there and feed them there - as soon as pup gets too much they will remove themselves from the situation to the places you have showed them.

Feed them on the shelf/window sill/bookcase for a couple of days then shut all exits and let them mix together........the pup will learn how far it can go before getting a smack from a cat or worse, getting ignored by a cat! The cats will learn that they need not run and that they are able to control the situation. Everyone will learn how effective ignoring the pup can be. Your cats will act several times more important than they used to and the pup will be in awe and worship them..........most of the time......

This has always worked for me, you may need to put a shelf or two up but it is well worth it for a happy house.

Cats are allowed on furniture - dogs are not - is another life saver.

Keep cats to a feeding time as well as dogs.......feed cats before dogs.......This means you only feed tiny portions to a cat that lives with a pup as the pup will be fed two or three times at least.