Many dogs live largely isolated lives, and rarely get the chance to meet, let alone play with new dogs. If your pup is going to get along with other dogs, they must continue to meet and play with new dogs.
The nature and frequency of looks can tell you a lot about dog relationships. When you’re working on socializing your dog, beware of doing too much, too fast.
Dogs at play will often look and sound like they are fighting. With a well-trained dog you can always check that things are in control by interrupting the play session with a bit of obedience.
Letting the little dogs off-leash first gives them a chance to explore and get comfortable. Some pups are naturally shyer, and need more time to build up their confidence.