Kellanrevere

It's a shame you don't know what the yorkie is mixed with. That would be of great help.
Remember, Yorkies were raised to be ratters. They are feisty and "determined". Once they have their mind on a "target" it can be very difficult to get them "off scent".
They are not always "group friendly". They generally want to be sole ruler of the roost. If your other dog will "stand down" and let the new yorkie have time to blend in, then you will have two great companions.
Paps are lovers and cuddlers. Their idea of hunting is playing with a toy or just being silly. They make wonderful pets and are quite sturdy. They are more "group friendly"
It will be up to the Pap to decide the harmony of your combined home.
It is doable with a great deal of love and patience.
Good luck. It sounds like a fun time to me!

I also have Cigna. They say 15 business days. Double & Triple check your dietician and physical therapy dates. Cigna originally told me 3 months of appointments then denied my surgery. The reason they gave was because I didn't have 89+ days of nutrition & PT counseling . Well, we all thought that 3 months met the requirement but they are very firm on that 89+ days. My doctors got me right in and resubmitted immediately . I received go ahead within the 15 days. Very picky, it cost them extra appointments. Good Luck.