Puppy Training - Play W/ Smaller Dogs

While I agree that avoiding unnecessary interactions where this pup can practice rude behavior towards small dogs is a good idea, it's totally understandable to want to figure out ways to help two dogs who will be seeing each other frequently (as is the case with the Pomeranian/husky owned by a family member) interact politely.

I would definitely only allow these two to interact under close supervision, and be ready to intervene at any sign of rude behavior. It might be helpful to have your dog drag a short line or traffic lead so you can easily grab that if you need to redirect. Keep interactions as calm as possible, and keep physical barriers between them when there's exciting things going on or no one's available to supervise them. Lillith is right about this being a difficult stage for many dogs, where they struggle with impulse control and reading or respecting other dogs' body language, so keep in mind that there may be some days where your pup is just too amped up or overstimulated and they need to be separated until he's in a better mental place.

I highly recommend parallel walking with them, where they're both on a leash and handled by separate people, then walked in an interesting area (parks or trails are great) far enough apart that they can't interact, but can get used to being around each other and doing polite, calm activities together. If possible, I'd suggest starting each visit with the two of them with a short walk like this, so they work off some of that over-the-top greeting energy in a way that doesn't mean your pup jumps all over the little one. You can also do calm parallel training, where you and a family member are both doing some low-key training games with your respective dogs where they can see each other but not interact, which can be a little more indoor friendly.