Is this a male/female combo?
It sounds like you are doing all the right things and now you just need to practice patience.
Ringo was my dominant, male, 4 year old Westie when we brought Lucy home and that first month was hell. But, slowly things became more normal and Lucy was just SO determined to get Ringo to play - that eventually she won him over.
It's a good sign that they can sleep so close together.
I would just make sure that Snick gets some special 'alone' time with you and 'alone' time away from the puppy to give him a little break.
__________________  Mommy to Lucy, Ringo, and Matthew |