My dog doesn't like to socialize with other dogs. She'll acknowledge other dogs but isn't interested in playing or communicating with them. She's not aggressive but she rather just be with me all the time.
She whines when she sees other dogs on their leash and it seems like she wants to sniff/acknowledge them.
The same thing with humans as well. She has a select few she will play with and cuddle but other people she'll ignore.
So I'm not sure if it's her personality type or if there's something I can or can't do.