home security or a pitbull

Found my dad reading fliers he got from the mall about this cool wireless security systems to be install at ones home. Actually, getting one is one of the most advisable thing to do, especially with all the crimes being shown on the news, burglars and other theft cases here and there. So I believe investing in one of those expensive security system is basically like covering for the safety of everyone in the family 24/7.
But for those who still believe in what we have used to, getting a huge and scary looking dog is still one of the best solution in protecting ones home! A pitbull perhaps?