Sorry to hear that Citygirl. Did they manage to break into the house or just the property? How scary.
We had Prosegur installed a couple months ago. The bad thing about living in a quinta in a bad neighborhood is that help from the police can be hit or miss, so you feel isolated and on your own. In addition to the big dogs, sometimes a little yappy dog (as annoying as they are) make for a good alarm system.
My mother-in-law's business was broken into several times in a short time frame -- apparently there's a family of delinquents living across the street in a house they're squatting. They would climb a tree and come in walking across the roof into the patio area and break windows to get where they wanted to go. They've stolen computers, vandalized, etc... and despite having it filmed on surveillance tape, the police have done nothing. So my mother in law turned the business into what looks like the outside of a maximum security prison.