And what are your most useful tips to make sure they will be friendly with other dogs?

Someone I knew has a dog that runs around the block and comes back by themselves, and will not listen to the owner calling them back. I do not want that.

I’ve been to a country where I saw no dogs on leashes. Some dogs following owners lazily and slowly riding their motorcycles when the human didn’t feel like walking, but had to walk their dogs anyways. I want whatever assertive and respectful communication these owners and dogs have.