Tips and tricks to stop whining?

Hi all! My parents recently got a rescue puppy and this baby whines and cries like crazy. So I’m looking for tricks to reduce it.

The puppy is about 16/17 weeks old – I am watching him for the week with my dog who is a 1.5 y/o 30lbs mutt. As with all puppies, he really struggles to settle. Even when I go up or down stairs with other dog he cries for hours. To me is a bit separation anxiety.

I was blessed and my boy was always very good at settling even as a puppy so this wasn’t something I had to work too hard at.

Does anyone have any tips to get me through this week? I will be attempting to use his crate more with a frozen lick treat to calm then hopefully pass out. It’s just constant when he isn’t getting what he wants.