Does your mum like dogs. Best detterent there is. A big bark will deter them. I go away alot and my dog makes the wife feel safe alone. Plus id not want to be the person who tries to get in my house with the dog.
50kg Akita flying down the stairs would be a brave man to tackle that
My 2x JRTs can give a nasty lick.
When they bark they sound like Chihuahas lol. Not much of a deterrent.
Sorry to hear of the break in, this was something that always worried me when i had my Mk5 GTI and the Scirocco GT. However, i leave the keys on show now we have the Fiat 500, in the hope someone breaks in and takes it.
Its ok though, as its the wifes car.