A ladies purse containing bank cards and cash was stolen during a burglary in Newport Pagnell while the owners slept upstairs.
At 2am on Monday othieves got in to a house in Hornbeam, through the back door.
The victims were at home asleep and were woken by their dog barking downstairs.
The crime reduction team has advised people to make sure all doors are locked and to remove the keys from the door. Keep all downstairs windows shut and locked, and only keep windows open upstairs when at home. Make a routif checking all doors and windows before going to bed or leaving your property.
Any witnesses can call police on 101 or Crimestoppers, anonymously, on 0800 555 111.