Leslie - do you have a copy of the lease you signed and does it say that they can enter your apartment without notice any time they feel like it. This just doesn't seem right. What an invasion of your privacy. What would keep them from coming in when you're home in the shower or asleep in bed? I feel that could be considered breaking and entering - I'd change the locks and look into the legality of this right away, you just can't assure the safety of your personal possessions and of course your sweet dog with people having such a free run of your home