Thatch has no concept of the term "personal space" and is always laying right beside or on top of Murphy.
People ask me if I worry about the dogs and the new baby. Murphy is so incredibly patient with Thatch (he chews on her ears, sits on her, steals her toys out of her mouth, everything) that I don't worry about her at all. I am a little worried Thatch will think Buster is his new buddy though and sit on him too.