
I would suggest waiting another 18 months for a puppy, or coantacting TT rescue for an older adult of 3 to 5 years old. Youy will be able to introduce themon neutral ground and be sure that the older dog will tolerate the pup, though expect the pup to be told off! Friendship will take a little longer, as first the pup would be expected to show some respect and acknowledge the older dog as dominant!
Two young pups will be a nightmare. There is enough to do keeping them groomed and trained in units of one, LOL :D