Need Yorkie to get along with GSP

We have a 13 yr old Airedale, 3 yr old Yorkie, & 7 month old German Shorthair Pointer. Our Yorkie has always been sweet and loving. However, she won't completely accept our GSP. She constantly chases and nips him. He is afraid of her and runs away which leads to a chaotic chasing situation that doesn't stop into we separate them. At night our Yorkie will lay next to him and walk by him while he is laying down. We've tried some different techniques, but can't find one that stops this.  Any ideas would be greatly appreciated. Thank you!

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