Oh yes. We discourage it as it has caused us some concerns in the past.
We were looking after someones Collie years ago, we couldn't find him anywhere, we have a largish bungalow and a big garden so we went everywhere looking for him. We spent about 20 minutes calling him, no avail. Eventually my husband decided he must have got out somewhere, but we didn't know where, all boundaries are secure. He got into the car and started to drive around. He returned home about an hour later, empty handed.
While we were standing dithering about the what if's and why's, we heard a very small noise coming from the dining room. We opened the door and there he was. He'd opened the door and shut it behind him. Boy, we've never been so pleased to see a dog before or since!
We now have security locks on all doors, I could not go through that ever again.:crazy:
One of our Rotties opened the back door and ran down the garden to come and play with me and a customer, with her dog. Very disconcerting when you see two Rotties running towards you, full pelt with excitement and saliva flung from every corner of their mouths.

No animal was harmed.
