My first husband allowed our dog to sleep in our bed (she slept on the pillow right above his head). I loved that dog, but hated the dog hair she left behind on the comforter and sheets and her doggy smell. It was a nightly ritual that I despised. When we divorced, I swore I'd never allow a dog in my bedroom again. My kids have never been allowed in my bedroom either. I don't have anything dangerous, or weird, or secret in there. There's nothing in there that they're not allowed to see. It's just that I feel that my bedroom is not for sharing with kids and pets. I allow my dogs and kids all sorts of freedom all over the rest of the house. But the master bedroom is off-limits. In the past 23 years, my dogs and kids have respected that and they know not to go in there. My dog stops in the doorway, lays down, and waits for me. She knows not to cross the threshhold. Even my 2-yr old grandson understands that's a room he's not supposed to enter. May be a little strange to some, but it keeps me happy.
