Yesterday I adopted a one year pup named Bart, believe to be a mix of a pointer and some sort of retriever. He is very well behaved, better than I could've asked for. He doesn't get into anything he shouldn't, listens well if he does, comes when I tell him, leaves things when I tell him to leave them, doesn't bark at other dogs and actually let's other dogs set the pace for new meetings rather than him get overly excited. The staff said he learns quickly from other dogs when he needs to be put in his place, which is a good thing to me.

Anyway, we currently have a 13 year old Yorkshire Terrier name Rosie. She is extremely independent, likes to relax most of the day, doesn't play, and likes her things untouched. She doesnt necessarily hate other dogs, however, she'd prefer they leave her alone and respect her space. She's not really the interactive type with other animals.

We introduced them to each other yesterday twice for a short period of time. The first time, Rosie sniffed him, like she usually does meeting new dogs, but then retreated away, indicating she really didn't want much to do with him. Bart tried jumping up to continue saying hi to his new friend, but I'll pulled him back with a soft, but firm "leave her" to which he responded to well. The second meeting went roughly the same, however, with my mom holding Rosie this time (my mom is Rosie's closest confidant when Rosie is feeling uncomfortable). She turned head away, once again, indicating she wasn't really interested in getting acclimated with him. She didn't tremble, yelp, whine, or anything or the sort, just turned her head away.

My ultimate goal is to at the very least get them to the point where Rosie can comfortably be in the same room as him, and Bart will respect her privacy and distance himself from her when she clearly displays that what she wants.

Any tips and advice will be greatly appreciated as no articles I found online were very helpful with a senior dog with her temperament.

Thank you!