The PCSO have no rights to come into your house, no power of entry at all. The Police themselves wouldn't have a power of entry either. All dog bite incidents have to be checked now as the law has recently changed. The dog will not get put down even if it had bit the other dogs owner, unless of course it has done this before. If the man says he was bit and you say no he wasn't , without more proof then it aint going nowhere !! The Police do however have to check that the dog is not a banned breed and if you wont allow them to check, then that's when things will change.