I agree about alerting beforehand rather than advising afterwards. However, both have their uses
My 6 year old Brittany girl was always keen of hearing but since my old cat, her pal, and her mum, Belle, died in the last few months she has become much more sensitive.
She often comes and looks at me when I can't hear or see anything and I have to go and check. Many times it's a false alarm but on the majority of occasions she has heard vehicles coming down our road and slowing before they even turn in here. So it's very useful in that I can be ready for visitors of any kind.
I also believe in sudden light. I have LED PIRs all around the house. So anyone intruding won't be able to determine when or where they will light up. A friend of mine put in an expensive set of 'dusk to dawn' lights only to be told by our community bobby that they were more likely to be helpful to a burglar than a hindrance - and in addition her neighbours complained about always being bathed in light when they were trying to sleep.