One thing I do is make friends with people who have dogs that get along with my dog on walks. We've seen movies, gotten food out together, etc. Or just intentionally walk around the same time to chat.

Also, hobbies. Try to find something you can be interested in that has meetups.

Could be sports, cars, books, quilting, chess. I've heard of photography groups that do photo walks or group editing hangouts at coffee shops.

On the other hand, it's also ok to be on your own sometimes. I love catching a movie at a theater on my own. Sometimes I'll go to the park without my dog just so I can relax at a bench or have a nice walk at my own pace.