My dogs love laying on my belly and listening and they all are lab mixes. As long as nothing feels like something is wrong with a dog that size you should be fine. I taught mine when I say easy that they need to be gentler.
I have an 18pound dachshund and he jumps all over my belly. Doesnt cause any problems.for me and my little girl so it really shouldnt be an issue.
Oh he's a Chihuahua, yorkie mix! He'll get bigger, but probably not over ten pounds. It doesn't bother me or cause pain, I just worry too much!
i think ad long as it's not causing you any discomfort your okay. if the dog will get any bigger, i would recommend breaking the habit & training him otherwise, it might cause problemslater if the dog gets bigger