Do dogs miss people much?

So I’ll be moving out soon, pretty far away, so I probably can’t visit a lot, especially at first. I just wonder if dogs feel sad or confused or anything like that when someone they’re close to is suddenly gone. My dog is 13 years old, I’ve had him since I was 8. He’s my guy, like he sleeps in my room, waits for me to come home, scratches on my door, goes on walks with me, you know just the usual, dog stuff. I don’t want his last years or whatever to be much of a hassle for him. I probably won’t be there when he dies. Idk it just makes me worry a little about how he’ll experience it. Is it that deep for dogs? Does anyone have any experience with that?