Just in case...(long and rambly)

I don't think my mom is going to make it to the summer waiting for a pup.  She has Friday's off, and this was her first one since Cash has died that she's spent home alone (with Reno).  She said she was really lonely, and "everything she does with him is wrong" because she did feed him the incorrect stuff for dinner and I won't let her walk him because honestly he's a pain and I don't trust that she would be on him the way he needs to be.  She wouldn't enjoy walking him either because he's not relaxing to walk with in the city, he's a bit of a project.  In short--he's not her dog and she feels that.  She misses cuddling with her own dog (Reno will cuddle as much as a bony sight hound body will allow, and will do it on his terms when he feels like it, but at any given moment he will spring up and start barking, so again, it's not like he's relaxing) and really wants a puppy I think.
 
She keeps showing me pics of puppies that she has her eye on, and I think we'll be going to visit a litter of mixes this weekend.  Knowing her, the visit will be the kiss of death and she'll have a hard time walking away (although I have talked her out of 3 different puppies in the last few weeks that would find life with pushy Reno miserable, and that mom would really not enjoy as an adult anyway), so the question:
 
If we do come home with a baby this weekend, what's the best way to intro she and Reno?  Reno can be a pushy doof with other dogs, but I get the sense that he'd view a puppy sort of like he does the cats: interesting and potentially exciting things that he might be able to chase, but otherwise sorta boring.  He will NOT like attention being focused on another being other than him, I know that, especially if it's me giving out the attention.  I'm envisioning lots of baby gates being used.  Reno is still crate trained and the pup will be too.  Where would they actually meet though?  This will be a pup under 10 weeks old, and Reno is....rough and spazzy at times, even when well meaning.  I don't want to scare her, or set any kind of precedence.
 
I'm very glad we've kept up with place work, crates, gates, and calm downs.  This will definitely be a test of his skills however.  I have to admit I'm a little nervous about rocking the boat with him...what if they don't get along as adults?  The reality is they don't have to spend much time together--my mom spends the majority of her time in the garage which is converted to an office/art room, and Reno spends most of his time with me in the house/out on errands in the car etc.  Lots of separation at first I think until she's bigger and some rules are established?
 
*nervous about the idea of a puppy but happy for mom who misses Cash*