First you need to know that their play style is completely different. Then you need to find out if it's true aggression. My older male GSD will try to play rough with my older golden and a simple leave it works.
Misty- Samoyed Mix, Tannor- Golden Retriever CGC
Robyn- GSD CGC, TC, Midnite-GSD CGC,TC, Brennan-Golden Retriever CGC, Batman-Husky/Greyhound , Apollo-GSD