M18
Nuff said...
Alarms?
Useless on a smash and dash
Dog props?
Useless, there are other observable tell tales that there is a dog around... if they are not there, no dog.
Sturdy doors and locks,
Some use, but a 200 pound man performing a running front thrust kick can generate more power than most residential construction can handle
Cameras
Useless, provides after the fact evidence... however from experience, PD doesnt care if you got the mut's picture... they dont care about residential theft or property damage. Odds of capturing a burgalar after the fact even with security cam footage? slim to none.
A dog
Some use... if it large enough and agressive enough to hold its own in a fight. If it yaps and can be punted like a football... useless.
Signs
Detrimental, basically to a burgalar any anti theft or security sign reads "break into this home, there is expensive stuff here"
Anyway... if some one wants in they will get in no mater what you do...
If you are at home you best be willing to go all the way to protect your space, or be willing to abandon your home and wait for the police.
If you are not home, unless you have a real dog who will rock an intuder's world... you are screwed.
Best way to deter a prowler? A well trained german shepard, malinois, pit, or rottie, or a pissed off home owner with a 12 gauge shotgun.
As for the attitude force is last resort... well sure, but you come into my home uninvited and im home? You die, pretty simple... if you come in unarmed trust me -before the PD Comes to clean up the mess, you will be if you catch my drift.

If im not home... you'll have to deal with Lucy.
Who is lucy? Shes a 70 pound pit mix, she is a brawler if threatened. If you hurt her and get away? I WILL track you down myself... you better hope the cops find you before I do. My dog is family.
Edit: forgot to mention... good neghbors, they can be quite useful. The kind of folks that know to ask a stranger in the neighborhood what hes doing round these parts.