He will be thorough and tidy, he will also be able to check for standard hidey-holes and be able to discern between what is worth taking and what is not. He will occasionally work at night but prefers to work during the day. If challenged he will be plausible and have an excuse for his movements. The professional burglar usually wants more time in the premises and so he has to reduce the risk of discovery. He will identify cheap and sub standard alarm installations which may expose one particular area of the premises to attack.
People put a lot of faith in dogs.
Many will do no more than inflict a nasty lick, others bark constantly thus doing no more than screen the noise of the burglar breaking in. If the dog is locked in a particular room, the burglar will merely work around the rest of the premises. Get specialist advice from Crime Prevention Officers, your insurance company, and quotes from several reputable firms. Some exterior lights have an infra red sensor that switches the light on for a few moments when it detects something in its range. A third of burglars get in through a back window.