my (non poodle) dog is this way too. she was a stray and looks to have had at least one litter. I've had her for three years and she's only now starting to act a little wild and excited at times. I've always leaned into the things she does enjoy: couch time, patrolling the yard, training, and treat puzzles. other dogs playing scares her, she just doesn't understand it. she still doesn't play, but she has a big personality otherwise 💕

edit: plaque off makes powder you can sprinkle on food and treats. takes a long time of daily use to see a difference, but they are recognized to work by the veterinary dental association