I do not use am alarm system. I feel they are too expensive and more reactionary after a break in occurs. I prefer to make it harder for them to break in, in the first place so they will go to a easier target. Yes having a dog helps a lot.
No it will not. Actually homes that show they have a alarm system attracts criminals because they feel the home must have something good to steal if they are protecting it was a home security system. I always tell people if you have a home security system installed do not advertise it.