A dog sitting on you is not necessarily a sign of dominance, although it can be. More often than not, if your dog sits on its owner’s lap, it simply means that they are trying to show their love and affection. As an example, golden labradors are known for their gentle nature, so it may be totally normal for your dog to want to sit on your lap because they are only trying to express how much they love you.
On the other hand, dogs can sometimes try to assert their dominance by sitting on you. By sitting on a human, can be a way for a dog to feel empowered and in control, and is most common in dogs that have recently been added to the family, as dogs have a pack mentality and will often test the waters to see how far up the hierarchy of the pack they can get. Alongside this, one of the main indicators that a dog is sitting on you as a sign of dominance is if they are growling and barking during the process, at which point you may need to talk to your veterinarian for some guidance.