How do you take care of a dog if you have a job?

I’m just really curious about this because I know many people own pets but I always thought that pets needed constant attention. If both people (or the lone person) in the house work(s), then how do you take care of an animal too? My boyfriend and I eventually want to get a dog. I love border collies, but I feel as though we wouldn’t be able to take care of a pet if we both have jobs. I only had a dog when I was really young and my mother was a stay at home mom, so I don’t have experience with this. How do you manage?