You might be feeling bad because your dog sleeps at the foot of the bed and you want them to be affectionate instead, but this is actually a sign of respect. Sleeping at the bottom of the bed is a submissive stance, so really they’re just acknowledging the fact that you’re the alpha. A lot of dog trainers advise against letting your dog sleep in bed at all because in nature the pack leader gets the most comfortable bed. However, if you encourage your dog to sleep with you, then they might do this to show you that they’re still obeying the pack rules.